How to Vent a Bathroom Fan That has Been Installed Directly Against a Roof

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This video shows how to vent a bathroom fan that has been installed directly up against a roof. The roof in this case was sloped shed roof, so there was no attic access above the fan. The fan had to first be removed from the ceiling, then a hole drilled through the roof from inside the bathroom (to mark the location of the roof where the vent needed to be cut in), and then everything done from there.
00:00 Intro
01:00 Removing Fan from Ceiling
01:17 Determining Roof Vent Placement
01:50 Attaching Duct Connector to Underside of Roof Cap
02:43 Attaching Flexible Duct Hose
08:02 Re-insert Fan Housing into Ceiling
09:35 Testing to Confirm Fan Works
10:48 Air Sealing Around Perimeter of Fan
11:39 Re-Installing Fan Motor and Outer Cover

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Опубликовано:

16 июл 2024

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Комментарии : 4

@arthurhughes8659 3 месяца назад

Thank You for posting this video!!! My roofers installed Broan 4" vents and left without installing any duct connectors. I didn't even know they existed until i found your video (none of the home stores in my area puts them on the shelf). I was trying to design an adapter when i found your video, and it saved me a LOT of work. --- BTW, they also misaligned the holes, so the adapters wouldn't fit, initially. I used a Dremel wood cutting wheel to round out the holes and then i connected the vents to the fans with insulated 4" ducting. The Dremel cut thru the roof panel easily from inside the attic, but laying on my back whilst doing it was awkward (to say the least).

@insulwiseenergycomfortsolu3293 3 месяца назад

Hi there, thanks for commenting! And yes venting these retroactively can be a bear. I'd say that we find that roofers misalign the holes about 99% of the time, so no surprise there. When we cut in our roof access to install the vent cap, we always cut a 6 inch x 6 inch hole. That leaves you with plenty of room for screwing in the connector from below, and the outer flange of the vent cap still adequately covers the hole on the roof side. I'm glad my video helped! Andy

@abbydiekmann3930 4 месяца назад

If you're using rigid foam board insulation above your drywall, should you use insulated ductwork in lieu of the insulated flexible ducting shown? Also, how did you seal the exterior of the duct on the roof side?

@insulwiseenergycomfortsolu3293 4 месяца назад

Hi, if the flexible duct hose is running through an environment where it could get cold, than the flexible duct hose should be the insulated type. However if the flex hose will be enveloped in insulation, you may not need to. We installed a roof duct cap on the roof. This is a Broan RVAK1A model and the sides slide right under the shingles. You NEED to use some type of designated roof vent to vent these through a roof.