Should I vent bath fan through roof, or soffit?
David B
13 years ago
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metaxa
13 years agomacv
13 years agoRelated Discussions
Bluestar Venting through the roof
Comments (6)The pressure drop needed to open a damper is not large, and once open the pressure drop is even less. Check to make sure that none of the moving parts are binding. Variable motor controls typically progress from off to full on to reduced power. This aids both motor starting and dealing with such loads as initial damper opening. For systems with large motors and long spin-up times, it can be useful for the operator to "dawdle" a bit changing from full on to the desired lower setting. kas...See MoreHow to vent exhaust fan through attic gable vent
Comments (14)Just to tell you where I am coming from on this - I wrote the book! (It's fun to say that.) "Residential Ventilation Handbook" It's been said pretty well already, but bath fans must vent all the way to the outside. Not just near an opening. Use insulated ducting to reduce the possibility of condensation in the ducting. Use 3 screws to attach the ducting to the hood. That will keep the ducting from turning or pulling off. Be careful that the screws don't interfere with backdraft dampers. (Cloth duck tape was made from the same duck material sailor's pants were made from. Not good at all for duct work.) If you can do it, transition from the 4" nozzle on the fan to 6" ducting. The flow will be much better. Point the nozzle of the fan in the direction of the exhaust hood. Air is lazy. It hates to make 180 degree turns. Here is a link that might be useful: Heyoka Solutions...See MoreVenting through roof not attached to anything?
Comments (1)So, you are not installing an exterior vented cooking appliance, as a function of your remodel?...See Moresoffit and ridge vents and/or/with attic fan?
Comments (16)I lived in my house for 20 yrs before I got an ice dam problem, and it was a big one. It was easy to understand. It was due to a particular set of weather conditions: a foot of snow on the roof, some melting, enough to fill the gutters with ice and onto the roof, and then a rain. My solution was to install anti-ice dam sheeting. I was due for re-shingling the roof, so I had the roofers to install an anti-ice dam sheet and there had been no problem since. The discussion below assumes there is already ONE layer of shingles on the roof. The anti-ice dam sheet is a waterproof, elastomer sheet that must be applied on the bare roof boards along the lower edge. It may be from 3 ft to 6 ft wide, the wider, the better. Any existing shingles must be removed, but only need to be removed where the sheet will be. The old shingles can be then re-installed over the sheet. The sheet is held in place with adhesive and will seal around nails driven through it. And then, the new, second layer of shingles can be applied over the entire roof. If the old shingles were not re-installed, then new shingles must be put in their place to avoid an unsightly ridge on the roof were the roofing changes from 2 layers of shingles to 1 layer. This ridge should be avoided since the top layer of shingles may tend to crack and/or break along this transition line. When finished, there should be two layers of shingles everywhere. An alternative is to remove all of the old shingles and discard. Ridge vent versus roof vents: When my house was built in the 1970s, the builders in my area were using soffett vents and roof vents. Recently in my neighborhod, I have noticed that roofers have been installing ridge vents when repairing old houses that did not have much in the way of roof vents. Ridge vents seem to more popular at present. A hail storm came through 2 years ago and many roofs were re-shingled (by the insurance companies), so I got to watch several repair jobs recently....See Moremetaxa
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