From inside the attic, select a spot on the sidewall for the flexible duct to exit the house. In the photo, the left end wasn't attached yet because I hadn't installed the insulation jacket over it yet. As you can tell from the photo above, making a hole to run the duct through was a major pain. I streamlined the new pipe all the way to the outside with a proper termination. The key to preventing mold and mildew growth is to get the moist air out of the bathroom before it has a chance to condense, and an exhaust fan is the best way to do this. Bath Exhaust Fans Routed Up Through the Roof This discussion is now found at 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. From outside, use 4¼-inch hole saw to cut hole for wall cap.
That's why we asked This Old House general contractor Tom Silva to show us how. I have a bathroom moisture problem. The cut doesn't have to perfect since the outside housing of the fan will cover any minor mistakes, but you still want to be fairly accurate so that you don't lose any insulation value around the outside of the duct pipe. There are a couple of issues to keep in mind. The fan would then start. This box can be attached directly to the joist or, if the hole is too far from the joist, you can use the special hanger that comes with the kit.
And, it turns out, everyone wants one. We discuss bathroom exhaust vent codes, specifications, advice. Next, unscrew the built-in receptacle from inside the housing to expose its wiring. Preventing backflow I don't trust the little flapper on the outside to prevent air from coming back into the house when the fan's not running. I used zip ties and lots of mastic to hold the duct on and seal it up. I wanted to make sure this one delivered, and it does. From outside, slide the wall cap into the duct hole and push it tight against the house siding.
When I take a shower and don't run the fan, the dew point in the bathroom gets up to the mid to upper 70s, a little higher than outdoor dew points this summer. Can I tap into this duct with a 45 and vent new fan outdoors? 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. Remove the wall cap and apply a bead of silicone adhesive to the siding and gasket around the hole. Most manufacturers put a noise rating right on the package. Unscrew and set aside the light bulb.
Removes air and kitchen odors well. A contractor with a metal brake can easily fashion this. I look forward to your column each week in the Worcester Telegram and I hope you will advise me in this matter. This was okay, until a breeze blows, straight back through the fan duct and into the space. Step 2 - Wire the Fan The wiring in every house is a little bit different. If your bathroom light is already wired into a wall switch, then that is the best place for you to wire your fan. Instead we vented this fan out through the soffit in the roof eaves.
Exhaust Fan Types and Quality There are several different styles of exhaust fans, as well as levels of quality. New duct damper technology provides a tighter seal resulting in reduced warm and cold air backdrafts. The hood was an additional cost, but reasonable and worked well with the fan's fittings. I'm pretty sure it impeded the flow. It may well vary from fan to fan but all the ceiling exhaust fans I'm familiar with don't really like being mounted vertically. Would it not be better to simply purchase a fan designed to be installed into a wall? Galow can be reached by email: or by telephone: 914-474-6613.
My only complaint about this product is that the louvers have warped in the few years we have had it. That way you can locate it directly over the hole. It removes all sorts of unwanted odors and smells from the bathroom. Then let your building super use the measuring tool instead of a piece of tissue - if they're willing to do it. Starting out, choose the exact area where the exhaust fan will be installed. It also helps to have a helper below measuring inside the bathroom, communicating measurements by cell phone.
I found some when I opened the walls. A bathroom fan does not need to be installed in a ceiling; it can be installed on a wall. I have been looking at Andersen and Jeld Wen windows. Step 1 - Open the Ceiling Ideally, your new exhaust fan will be mounted right over the hole in your ceiling where the light is. Then the 1-by trim board on the outside. That's why it's important to measure.
Each unit delivers the superior performance and quality features. Here's a photo of the fan on the left and the Cape Damper on the right. Here, This Old House general contractor Tom Silva shows the proper way to install a bath vent fan. The upper termination of such ducts shall be equipped with a wind-blown ventilator cap. Any air direction change reduces flow, as does the flapper, diode, grille and the flex pipe. Would Marvin be in line with that price? Installing a ventilating fan in your bath will help eliminate fogged-up windows, steamy mirrors and stale odors.