28.03.2015

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Author: admin  //  Category: Ceiling Lights


Summary: How to install the venting duct system for a bathroom exhaust fan to make sure humidity and condensation are properly exhausted outdoors. When you install a bathroom fan do not let flexible ductwork sag because this will reduce air flow. How to Wire a Switch for an Inline Exhaust Fan – Each pair of wires will act as a switch to control one side of the low voltage power.
How to Install Bathroom Exhaust Fan Electrical Wiring – Fully Explained Photos and Wiring Diagrams for Bathroom Electrical Wiring with Code Requirements for most new or remodel projects. How to Wire a Switch for Bath Exhaust Fan and Light – You will be using multiple switches for individual functions. Questions and answers about home electrical wiring, wiring installation, troubleshooting wiring problems, inspection and repair.
Depends on personal level experience, ability to work with tools, install electrical circuit wiring, and the available access to the project area.
Identify the panel circuits found in the project area, turn them OFF and Tag them with a Note before working with the electrical wiring.
Electrical parts and materials for home wiring projects should be approved for the specific project and compliant with local and national electrical codes.
Installing additional home electrical wiring should be done according to local and national electrical codes with a permit and be inspected.
I think your site offers the the clearest and best electrical information for homeowners I have ever seen on the net.You have given me confidence to do my own projects which I never had before.
I wish I found this site earlier, it is by far the best electrical related resource I have found on the web. Mobile Home Exhaust Fan Motor Exhaust fan motor used in vented hoods, side vent exhaust fans, and bathroom exhausts of mobile homes.
A kitchen sidewall exhaust fan that is part of the original house can be replaced with a different type of oven exhaust fan or removed altogether. Ceiling fans in bathrooms vent out bathroom moisture and odors through ductwork and into the atmosphere. Electrical Question: I have bought a small extractor fan or exhaust fan which I want to install in my bathroom. I want to make it go on only when people enter the room so I bought a motion occupancy sensor. Precaution: Identify the light circuit, turn it OFF and  Tag it with a Note before working with the wiring.
Notice: Installing additional electrical wiring should be done according to local and national electrical codes with a permit and be inspected.
Materials: Make sure the occupancy sensor has the same amperage and voltage rating for the electrical load, and is fully compatible with the electrical circuit and the device it will be controlling. The wiring is straight forward except that some of these occupancy sensor switches require a neutral wire for the 120 volt applications.
The electrical wiring would be connected with the power source in and load out to the bathroom exhaust fan, a neutral wire if required and a ground wire. Below is one example of a occupancy motion sensor switch wiring diagram which should be helpful. Please read the complete installation instructions for your specific motion occupancy sensor switch for your bathroom exhaust fan.
Answers to all of your questions about installing a bath exhaust fan and your bathroom exhaust fan replacement project. I have had an electrician install motion sensors in the powder room and bathrooms to control the exhaust fans. Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Certified Electrician or Licensed Electrical Contractor. Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area. Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring.


Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.
How should the bath vent fan duct terminate, how should it be closed, screened, & at what clearance distances from other vents? BATHROOM VENT DUCT TERMINATION - CONTENTS: how should the bathroom exhaust fan duct terminate at the buildnig wall or roof? We also review recommended clearance distances between the bath exhaust duct end opening and other building features such as a gas fired water heater exhaust opening.
This article series explains 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.
Don't terminate your bathroom exhaust fan ductwork as we illustrate in the photographs shown at left and below.
Our photo at left and two additional examples seen at below left show two typical bath vent fans that spills directly into each building's attic - both are improper vent fan installations. Terminate the bath vent duct outside at gable end or eaves: horizontally through the building wall at a building gable-end wall (first choice), or if the gable end is too distant, terminate the bath vent down through a building soffit at the roof eaves. Don't just blow the bath (or kitchen) vent exhaust into an attic, nor, even more crazy, into a ceiling or wall cavity or into a crawl space. If you were not convinced that failure to properly spill bath vent air and moisture outside can lead to attic mold, notice our photo (below left). Brown mold was found growing on the attic side of roof sheathing in this new home only where the bath vent moisture was spilling into the soffit (but not outside). Reader Question: what kind of ductwork can be used to terminate the run of piping from the fan to the soffit? For soffit ventilation, what kind of ductwork can be used to terminate the run of piping from the fan to the soffit?
When we install a vent fan out through an attic and down out of the soffit, we like to use solid metal ductwork (photo above left) to maximize air flow and minimize resistance, keeping the run as short as possible. And I would buy a proper rodent-proof vent opening cover (photo above right) and cut a hole in the soffit to install that device, connecting it to the duct.
In my photo at above left we had not yet trimmed the metal duct to proper length to protrude through the roof overhang or eaves at the proper distance to fit the vent opening cover )shown at above right). If you just drop the end of the duct into the soffit bay that is in turn covered by perforated panels, I worry that a substantial portion of moisture and vented air will just blow back into the attic. Venting bath fans through up the roof surface?: While we agree that building exhaust ventilation is most powerful and thus effective when it is routed vertically, we prefer to avoid venting bath fans up through the roof, both to avoid an extra roof penetration (and leak risk) and to avoid condensate leaks into the bathroom ceiling. Terminating exhaust fan duct at the ridge vent: our photo (above left) shows a typical attempt at venting a bath into or actually just below a ridge vent - this direction of vent exit may seem convenient but we don't like it much. In the photo (left) the droopy flex-duct will certainly invite bath moisture to condense and run back to the home's ceiling rather than exiting at the ridge. Terminating exhaust fan duct on the roof surface: at above-right we show an ugly bathroom exhaust vent installation through the roof surface using a laundry dryer sidewall vent cover. Venting a bath exhaust fan straight up: Our sketch shows a bath vent fan exiting up through the roof. The through-roof vent approach gives us another roof penetration, a possible leak spot, and it almost assures that condensing moisture will drip down the vent duct and into the bathroom ceiling.
A direct through-wall bath vent fan design may be preferable if the building roof shape, bath location, or other details make it difficult to exhaust a ceiling-mounted bathroom exhaust fan. In other words, some bathroom locations and designs such as first floor baths in a multi-story home, are vented out thorough the building sidewall not up through the attic.
Do not vent bath fans into a crawl space: you're only putting more moisture into an area where it is already going to be a problem, inviting mold growth on wood surfaces and hidden mold growth in building insulation. Protect the bath fan duct outlet at the building exterior, using approved screening or a louvered fitting so that you do not invite birds or rodents into the building through the ductwork. While we don't want a (lint collecting) screen over a clothes dryer vent termination (that's a fire hazard) we do screen bath or kitchen exhaust vent terminations to keep out birds, bats, and rodents. Watch out: an improperly installed bath or kitchen vent fan can draw sewer gases or other odors from outdoor sources right back into the building.


Watch out: inspect the kitchen (KITCHEN VENTILATION DESIGN), bath (BATHROOM VENTILATION DESIGN), and especially laundry dryer vent outside screen regularly and clean or clear any blockages such as by debris, dust, lint, leaves, or anything else.
See CLOTHES DRYER VENTING for examples of vent duct terminations, screens, and safety concerns.
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.
If I ran my bathroom exhaust fan duct outlet out of my soffit is there any minimum clearance from the bathroom window so it will not draw in the odors if someone happened to open the window.
Ryan you'd want to be 10 feet from the nearest operable window if you want to avoid odor intake; that is not a code specification it's an opinion. Continue reading at BATHROOM VENT DUCT PROTECTION or select a topic from the More Reading links or topic ARTICLE INDEX shown below.
Try the search box below or CONTACT US by email if you cannot find the answer you need at InspectApedia.
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. The low voltage relay is located near the in-line exhaust fan where it will act as a switch for the 120 volt power for the in-line exhaust fan.
A mobile home that Manufactures portable roof vents, roof exhaust fans and bathroom vents to ventilate the whole or entire building for modular buildings, office trailers, construction J. If your occupancy sensor requires a neutral connection then a neutral of the light that you want to control must be in the switch box. Does the existing soffit mesh of a newer home need to be cut away and replaced with some other register, or will the existing mesh allow a 110cfm fan to operate efficiently? Certainly use of flexible metal ducting and even plastic flex duct are permitted in many jurisdictions but in our opinion those are less effective choices.
That device is automatically opened by pressure of the exhaust fan and snaps shut when the fan is off, avoiding possible back drafts through the bath exhaust vent fan system. Not only were the roof shingles torn up and sealed again to leave a leak-risk around the vent penetration of the roof surface, but because this roof exhaust vent was installed on a home in a snow-climate, in winter with snow cover on the roof the vent is likely to be blocked. Below this home the clothes dryer, bath vent fans, and even a dishwasher drain all were dumping into a soaking wet crawl space below the building. My house came with a bathroom exhaust fan that automatically turns on when the overhead shower light is turned on.
The text is intended as a reference guide to help building owners operate and maintain their home effectively. If there is not a neutral wire of the light circuit at the switch box then you may not be able to install the occupancy sensor.
Question by damnnatzis: Is it possible to install an exhaust fan in a mobile home bathroom that has, obviously, no attic.?
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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.
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