Bathroom vent fan troubleshooting,ceiling fan light conversion kits necessary,hunter palm ceiling fan parts - PDF 2016

Bath vent fan installation, troubleshooting, repair: this article series explains why bathroom vent fans are needed and describes good bath vent fan choices, necessary fan capacity, and good bath vent fan and vent-duct installation details. We explain how to install bathroom exhaust fans or vents, the vent ducting, the vent termination at the wall, soffit or roof, vent fan wiring, bath vent duct insulation, bath vent lengths, clearances, routing, and we answer just about any other bathroom ventilation design or installation question you may have. Ventilation in bathrooms is important to prevent moisture damage to wall and ceiling surfaces, decay of wood trim, saturation of building insulation, and mold contamination. Especially in bathrooms where a shower is used, large amounts of moisture are added to room air and are concentrated in this area.
Our photo (above-left) shows a horrible bathroom ceiling vent fan ductwork job: multiple ducts sprawl around in the attic, all joining to terminate at an attempted through-roof vent that has fallen back into the attic. Flexible plastic vent fan ductwork: shown at above left is a common use of un insulated, flexible ventilation fan duct.
Flexible metallic exhaust fan ductwork: shown at above right is flexible metal exhaust fan ductwork. Our photo at above left illustrates a solid metal bathroom exhaust duct along with the bath vent housing installed in a cathedral ceiling during new construction. Because this is a sloped cathedral ceiling it was not possible to slope the fan ductwork back down towards the shower below the fan. I'd have preferred using a fire-resistant foam, but if the above conditions are met you should be ok. Flex duct routing details: If you are using flexible fan duct, stretch the flexduct tight to keep it as straight and smooth inside as possible.
Do not spill bath vent air into the building attic or roof cavity where it will condense on and damage building insulation, roof sheathing, possibly framing, and where it will certainly encourage mold growth. Isn't there a danger of wet bathroom exhaust air re-entering the attic through the soffit vents if the fan is exhausted through the soffit? Our article BATHROOM VENTILATION cites the importance of venting bath vent fans to the outdoors, not into an attic or crawl space.
The question about moist air reentering an attic through soffit vents after it has been blown out of an exhaust vent opening is a fair one, but I don't think that's likely to be a significant building moisture source.
Or speaking from empirical experience, having inspected several thousand homes and having looked very carefully at moisture and mold stains and patterns in attics and under roofs, I've not found any instances of back-venting of problem moisture into the attic through the soffit vents near the bath exhaust vent that presumably is blowing out through the same soffit or a nearby building vertical wall. Bath exhaust fan duct length specifications and restrictions are discussed separately at BATHROOM VENT DUCT LENGTHS. Reader Question: is it OK to vent a bath vent fan straight-up, vertically out through the roof?
I am going to install a new bath fan, I am having a new roof put on the house and decided now would be a good time to put the vent on the roof.
My question is I got a vent for 6" ducting, I will need a reducer at the fan end to 4" Would this be a good size duct for the fan.?
You've raised several key topics, and your question helps us realize where we need to work on making our text more clear or more complete. For example on site I might notice something about your attic and roof structure, ease of routing venting, placement of insulation, and even very basic stuff like - where the heck is your home?
I prefer to run a bath vent to outdoors via a horizontal line that goes across an attic and out through a gable-end wall or one that vents down and outside through a roof overhang or soffit.
The vertical run guarantees that any condensation runs back down into the fan (risking damaging the wiring or fan motor) and back into the bath or bath ceiling. The vent fan manufacturers installation instructions typically give maximum run lengths and recommended vent diameters for their products; long vent runs and vents that use plastic dryer-type flex-duct (not your case) cut the effectiveness of the fan by adding airflow resistance and thus increase the risk of accumulated moisture too. I am guessing that for a very short bath vent duct run, going to a larger duct size is fine - it'd make no difference but you're probably not gaining a thing on a short run by using a 6-inch duct to vent a fan that expects to vent through a 4-inch duct. In my experience inspecting and troubleshooting buildings, I've seen many bath vent fans that seemed ineffective. The fan capacity you need depends on the size of the bathroom being vented - usually calculated in cubic feet.
Sorry that these notes are a bit long on arm-waving and short on more specific details, but as we've got no information about your particular installation except what's in your original note, I have to stop here. Bathroom vent fan duct length restrictions: keep the fan duct length as short and straight as possible. Some manufacturers require a minimum distance between the duct outdoor termination and the fan assembly; a review of installation guides for several bathroom vent fan models did not come up with a maximum distance.
Details about maximum and minimum bath fan duct run distances or lengths are at BATHROOM VENT DUCT LENGTHS. Typically the bathroom vent fan is powered by the bathroom ceiling light fixture circuit; some installers, particularly in hotels or rental units, hard-wire the bath exhaust vent fan to force it on when the bathroom ceiling light is on - thus assuring that the vent fan is in fact used.
Continue reading at BATHROOM VENTILATION DESIGN or select a topic from the More Reading links or topic ARTICLE INDEX shown below. I have come across your site 3 times, as I continue to get our recently purchased 1950's home up to snuff. Are there any restrictions on how close an exhausting bath vent may be placed to an exhausting vent for a gas water heater? You will see that the required distances range from 1 foot to 7 feet depending on what's being cleared-from. My builder has installed a small 4" extractor fan in a newly created utility room with a door to outside, but no windows.
Mary I'm not sure I've got the whole picture, but I'd agree that a metal or plastic duct liner would have made cleaning easier and would have reduced the chances of damage should moisture accumulate in or condense on the sides of the air path. Question: Can I vent a bathroom into the attic space that has soffit vents and a ridge vent?
Well air flow may carry moisture but enroute, flowing across attic surfaces it will also deposit it on cooler surfaces - leading to mold-sorrows later.
We get a sewer smell in two of our four bathrooms in the fall when it turns cold and also in the spring.
You might also be facing odors exacerbated by partly clogged drains or defective vent piping.
Anon the best answer is site specific - depending on framing and construction details such as which way ceiling joists run I might go into the ceiling and then out through the wall, or I might place a vent right into the exterior wall.


Your installers needed to adequately seal or baffle around ceiling vents, ducts, HVAC air intakes, etc.
There is a more serious worry here if your bath vent is for a ceiling exhaust fan: loose fill insulation that enters a power-operated bath vent can clog it leading to overheating and a fire. We moved into a house built in 1999 in north Florida and learned that the bath exhaust fans are connected to the HVAC ductwork and not to the outside.
I can't be as smart as an on-site expert who will see important details we can't, but what you describe sounds wierd to me. Why is the air from my bathroom exhaust fan blowing down into the bathroom instead of blowing up and out?
If your fan is ONLY an exhaust fan then it's running backwards OR there is no exhaust vent.
John Cranor is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060.
Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors.
Bathroom Ventilation Fan Duct Lengths: What are the maximum & minimum recommended lengths for bath vent fan ducts?
BATHROOM VENT DUCT LENGTHS - CONTENTS: specifications for recommended minimum & maximum duct lengths for bathroom vent fans? Here we provide specifications for recommended minimum & maximum duct lengths for bathroom vent fans. This bath vent fan installation, troubleshooting, repair article series explains why bathroom vent fans are needed and describes good bath vent fan choices, necessary fan capacity, and good bath vent fan and vent-duct installation details. Our bath vent fan duct installation photo (above-left, courtesy Galow Homes) shows use of solid metal 4" ductwork conducting the fan exhaust to an outdoor soffit under a cathedral ceiling roof.
Any condensate in the ductwork drips to outside - a possible winter icing worry, but because of the solid foam insulation there should be little condensation in the fan duct. Take a look at the vent fan installation manual for the particular bathroom vent you are installing. In our photographs above, courtesy of Galow Homes, three long, un insulated bathroom exhaust fan ducts cross the cold attic floor of a New York home and then join together at a common sidewall exit of the same diameter.
The bath vent fan installation manuals we reviewed did not specify a maximum exhaust duct length, they just say route the duct to the outdoors. Is there a minimum distance from your outside main gas line and meter that a bathroom fan can be vented out to at the side of your house? I haven't seen a gas code specification for the required clearance between a bathroom exhaust vent fan outlet and an incoming gas line or pipe at the building, perhaps because an exhaust vent opening should be venting only one-way: from the building interior to the outdoors.
If you are concerned that the exhaust fan flapper that should close to prevent back-drafts of outdoor air into the building could malfunction and admit leaking gas from an LP or natural gas pipe or from the gas vent found at an outdoor natural gas meter, if you match the TEN FOOT clearance distance required between an air conditioner air intake and an LP gas tank, since that is the largest clearance that applies for most residential building conditions you should be ok. We discuss gas piping and gas tank, regulator clearance and various building features in our article titled "LP Gas Tank Inspection & Reporting " - you can find the article by searching InspectAPedia for that title. You note the best practice is to terminate the bath vent duct: horizontally through the building wall at a building gable-end wall (first choice), or if the gable end is too distant. Longer duct runs provide more air resistance, a problem you can mitigate by using solid metal ducting or metal flex duct rather than the more sinuous plastic and wire flexduct often found in these installations.
Readers needing depth in design theory and product recommendations for kitchen and bath ventilation systems should also see our BATHROOM VENTILATION DESIGN and KITCHEN VENTILATION DESIGN.
Continue reading at BATHROOM VENT DUCT MATERIALS or select a topic from the More Reading links or topic ARTICLE INDEX shown below. Also I an using metal ducting and it's about six feet from the fan to the roof, Should I angle the duct a little or would it be ok to go straight up.? Questions & Answers on bathroom vent fan and fan ducting installation procedures, codes, standards. Plan the installation so the vent duct is as short as possible and makes as few turns as possible. A bathroom vent fan removes steam, which can fog up mirrors and windows, and moisture, which can collect in a bathroom and lead to problems like mold and mildew if it Other Reasons for Installing a Vent Fan. Lowe's home improvement expert, Mike Kraft, gives tips on proper installation of an exhaust fan to remove excess moisture in your home bathroom. Bathroom vents are typically electric fans recessed in walls that vent directly outside (on a first-floor bathroom) or through the roof soffit (on a second-floor bathroom). Find best value and selection for your White Plastic Undereve Soffit Bath Fan Vent search on eBay. In this installation the duct is improperly installed, spilling directly into the attic space of the building. This material is more smooth-surfaced than the plastic product shown at above left and by its flexibility, can eliminate the need to install many elbows in the system. Solid ductwork has a smoother interior surface that improves airflow, though it is indeed more trouble and a bit more cost to install. The ceiling cavity between the I-Joists was later insulated with solid foam, as shown at above right.
I sprayed insulation foam ( not the fire block ) around the bathroom vent fan in an attempt to seal small air leak from the attic .
Take a look at the bathroom vent fan duct installation in the photographs above and you'll see a succesful bath vent installation in a foam-insulated cathedral ceiling. Once blown at any velocity into outdoor air, the moist bath vent exhaust air is diluted significantly.
Is it ok to vent the bath vent fan through a larger duct size than the fan's outlet diameter?
A competent onsite inspection by an expert usually finds additional clues that would permit a more accurate, complete, and authoritative answer than we can give by email alone. Bath ventilation worries may be a bit different in a cold climate than in a warm dry one and different again in a wet humid climate. I prefer to minimize the number of roof penetrations on any building since every penetration is a potential leak point, more so if the penetration flashing is not installed correctly.


Metal duct work (your case) is in my opinion always a better installation: smooth interior means better airflow.
A fan that nobody uses because it's too noisy means a bathroom that is rarely vented adequately (risking mold, smells, even wet insulation). That figure is matched against the fan manufacturer's recommendations for fan capacity measured in cubic feet per minute (CFM). Our photo (left) illustrates damage we found in a building ceiling where the exhaust vent duct had been torn during installation. The electrician wants to finish the job quickly and get paid and go home for a beer and to watch the World Cup on TV. The building inspector doesn't want to crawl into a hot attic, and furthermore, cannot possibly inspect every detail of every job - so over time the inspectors tend to get to know individual contractors and to trust (or not trust) their work, making just spot checks on it.
I am following up on this with the buildings inspection office and getting everything rerouted properly. Cramer is a past president of ASHI, the American Society of Home Inspectors and is a Florida home inspector and home inspection educator.
The text is intended as a reference guide to help building owners operate and maintain their home effectively. A bath vent fan duct that is too short may violate the manufacturer's installation instructions, may not work properly, or may be drafty; a bath vent fan duct that is too long may restrict air flow such that the fan is not functional.
Also we insulated the full outdoor soffit bay where the duct exits the building to avoid condensate icing.
There is little chance that these bath vents will work effectively and a good chance of pooling condensate in the low spots of the duct run.
To avoid unnecessary reductions in air movement through the bath vent exhaust system, avoid elbows and bends as much as possible. The bath vent exhaust duct shown in our photo (above left) continued to snake across the building attic - too long, too many turns, too much up and down variation in slope - it was an ineffective installation that collected condensate inside the ductwork. In addition to a vent fan, a bathroom unit may have a light, night The installation of an exhaust duct for a bathroom fan is about the same as the process for installing a dryer vent duct. The details of installing your the duct to the vent shroud on the fan housing and the other end to the vent. It is easy installing roof flashings, that don't leak, for all bathroom ceiling fans or bathroom ventilation fans.
For How To Install a Bathroom Exhaust Fan with Wiring Diagrams, Photos, Questions and Answers. A soffit vent installation will do a 90 -95 % job that a going up to the So this spring, I'll be installing two roof vents for the bathroom fans. Vent fans remove excess moisture from bathrooms, which are high-humidity areas Bathroom Soffit Vent – White-Mounts flush to soffit for a virtually invisible installation.
Products like the Craftmade Lighting TFV70L Decorative Bathroom Exhaust Fan, FanTech UEV4 Plastic Soffit Vent, and more. Products like the FanTech UEV4 Plastic Soffit Vent, Craftmade TFV70HL Exhaust Fan, and more. I recently replaced two bath fans and vented them both through the soffit using these undereave vents. This duct material is least costly at the time of installation but may be most costly when a combination of accumulated condensation and duct damage leaks into the building insulation or ceiling cavity. The CFM rating of the fan in turn presumes that the vent routing, diameter, length, and number of obstructing turns and bends is within the company's specifications. I have two concerns; first when I have this running for one bathroom i don't want it sucking all the heat out of my house (in winter) from the other 3 bathrooms.
Or should I try to go around the upstairs rooms to get to the gable attic, and to a vent there? I reviewed various industry sources and did not see a maximum allowable distance, but typically we see it's 10 - 12 feet or less. It also helps to eliminate unpleasant spells by ducting Barb asks, “We would like to install an exhaust fan in our bathroom to remove excess moisture but do not have an attic to vent it through. Booster Fans – Lint Trap I have a bathroom exhaust fan that vents to the outside are better off replacing the fan that goes through the wall. I am getting a new roof installed (and tear-off and likely a lot of plywood), and am simultaneously getting a new bath vent fan. The second just seems like a long distance, but I can't find much info about venting out the side of the house. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. 71-78, Association for Preservation Technology International (APT), available online at JSTOR. Quiet fans – In order to be effective, a bathroom fan needs I recently installed this vent in my aluminum soffit after remodeling my bathroom, which included adding an exhaust fan. Second I have some long runs in my conditioned attic (60-70ft) is this too long and should I pitch the pipes or worry about condensation ? Galow specializes in residential construction including both new homes and repairs, renovations, and additions. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
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