Replies

1. 
   Guest_ | Aug 22, 2000 07:32pm | #1

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   what's the roof pitch ..
   and how much snow we talkin ?

   what is you outside design temperature ?

2. 
   Doug_Brett | Aug 22, 2000 07:40pm | #2

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   Roof pitch is 4 in 12.

   I live in Mt. Tremblant Quebec. Average snow pack during the winter is 2-3 ft. Average snow depth on roof about 12-18 inches at the eaves. (max would be about 24")

   The vent would be about 10 ft from the peak (where the snow would average 6-12 inches) and 15' from the eaves.

   Outside temperatures reach -40° but would average -15 to -20 from Jan- Mar.

3. 
   Guest_ | Aug 22, 2000 07:53pm | #3

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   Brett,

   Not a problem.

   What is the exhaust pipe/duct reguirements for your exhaust unit?

   Gabe

4. 
   Doug_Brett | Aug 22, 2000 10:14pm | #4

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   Exhaust duct is 7" or 3 1/4 x 10". The rectangular duct would be an easier fit but I could use either. It would be about a 3' straight run to the roof cap.

5. 
   Guest_ | Aug 22, 2000 10:59pm | #5

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   Doug,

   That's a nice short lenght to work with and you should be easily able to get peak efficiency out of you range hood. I lean using the rectangular duct openning.

   I would go to a local sheet fabricator in your area and have them make a roof vent for you with the proper flashing to match your roof pitch and style of roof. You can paint the finished product to match your roof colour.

   Gabe

6. 
   Ron_Budgell | Aug 23, 2000 01:51am | #6

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   Doug,
   Call a HVAC supplier first to see whether they have a roof cap with an opening of around 30 sq in and an integral damper. It shouldn't be hard to find one, but failing that, you can use a standard low-profile roof vent. Bring the pipe through the roof, flange it over and shingle in the vent over the hole.
   I think a good damper at the roof line is important, though. The range hood itself will probably have some little flap of metal in it, but it will leak. A little leak could result in a big ice build up at the roof or even in the pipe.

1. 
   Doug_Brett | Aug 23, 2000 07:49pm | #7

   *Thanks guys for the good advice.Doug

7. 
   Doug_Brett | Aug 23, 2000 07:49pm | #8

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   Simple questions for cold-climate builders:

   Is there a problem with venting the range through the roof in a cold and snowy climate? If it's OK, is there a specific roof cap design that works better than others?

   My new kitchen design doesn't allow a wall vent without a tortuous route and even then it ends up venting too close to the kitchen window.

   Thanks,

   Doug