Replies

1. 
   Guest_ | Jan 23, 2000 09:38am | #1

   *
   I've never seen a microwave vented....

   Rich Beckman

1. 
   Guest_ | Jan 23, 2000 09:43am | #2

   *And what, pray tell, are you venting? Last time I checked, my microwave was not spewing any kind of exhaust or fumes. A straw through the top might suffice.

1. 
   Guest_ | Jan 23, 2000 10:35am | #3

   *It's probobly an over-the-range type microwave with a built in exhaust for the range.Jerry

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   Guest_ | Jan 23, 2000 08:00pm | #4

   *My guess is Jerry's right. I just put in two of these in the last month. Personally, I wouldn't use the flex duct, and the directions (really, I read them) recommend against it, but at the same time say that if used, they count as twice their installed length when calculating "effective duct length" so the blower works properly.My prejudice against them is that grease can get stuck in the little folds, and possibly cause a grease fire there. I would use the rigid stuff. Here's a tip for you, Dan: go to a heating supply store and pick up some aluminum tape to seal the seams after you install your duct, whatever you use (still need to use screws to hold the duct together). It will keep grease vapors out of the cabinet above, and everything will stay much cleaner. The tape has a liner which you peel off and then stick it to the duct. It sticks like mad.Good luck. Rich.

1. 
   Guest_ | Jan 24, 2000 03:05am | #5

   *Dan, I'm gonna expand on Jerry and Rich's comments and re-emphasize Fred's: Every range hood/microwave installation I've done had provisions for a standard 3-1/4"x10" rectangular duct. Some basic range hoods can use the 6" round duct, but you may have to use a transition if you plan to connect from the microwave to round duct, which then should be solid galvanized duct, screwed together, and taped with the metal foil tape. Do not use "duck" tape... it ain't "duct" tape, and duct tape no longer meets code in at least some localities.Exhaustedly, Steve

2. 
   Guest_ | Jan 24, 2000 07:31am | #7

   *I assume this is a built-in range hood -- flex duct is a clear code violation ... CABO § 1802 requires smooth interior copper, stainless or galv. "substantially" airtight duct to the outside. Mfr instructions are always to be followed, but I would take this requirement seriously -- picture a grease fire inside your wall. (Eeek! Another reason to cook healthy.)Interesting -- the code also prohibits backdraft damper. I think most systems (including mine) have these. I kept the duct separated from inflammable surfaces with bare fiberglass insulation.

2. 
   dan_fahy | Jan 24, 2000 07:31am | #6

   *
   is it ok to use 6" flexible metal ducting vs ridgid metal to vent a microwave. total distance
   5'. also is this ok by code in norwalk, ct.

   thanks