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Question DetailsAsked on 11/28/2016

Who can I hire to vent my over the range microwave through my roof? New OTR microwave replaces range hood.

Brand new OTR microwave installed but not properly connected to duct that vents through the roof. The electrician we hired to do so failed. Who can properly vent our microwave through the roof?

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1 Answer

Voted Best Answer

IF you just want the vent from the hood connected through the roof to a roof vent hood, you have 3 common choices:

1) Heating and A/C contractor - ducting and venting is their normal work, and they would be most familiar with the connecting and insulating (if cold attic in winters) the ducting - but their record at leak-free roof penetrations is not always very good and they sometimes damage the roof putting the vent hood in

2) Roofing as your Search the List category would be expected to do the best roof job, to avoid leaks - but some will not hook up ducting and others do a really sloppy (or non-existent) job like the electrician did.

3) Handyman - get a conscientious one one with good roofing and some duct installation experience and you might have the best combination - problem is while some handymen have a long history at multiple trades or in general contracting and then decided they wantedto work for themselves, or took up Handyman work as a semi-retirement job, a lot of handymen are also marginally employable or skilled or are downright sloppy or lazy - so unless you already know a good handyman or are able to inspect the work in the attic yourself as they are doing it, that might not be a great idea.

Rereading your post, not clear to me - sounds like maybe you already have a duct through the roof, so you just need the ducting connected from there to the microvent ? If so, then Handyman should be able to do it - just be sure he knows you demand that the joints be properly sealed (and insulated if it will get below freezing in the attic, to prevent condensation dripping down through the fan) and that you want positive sealing at the roof. And if that is the case, ask HOW he intends to get the duct (which should be rigid, not flexible, as that picks up grease inside real quickly and does not have great lifespan) connected with both ends already established.

Answer - either of three ways is right - a) if top ducting is loose or can be released from the roof fastening from inside, slide that up to get the duct in place, then lower roof penetrating piece down to connect it; b) If roof-mounted ducting is rigidly connected already, then a full-slip adjustable 90 connection - which can be adjusted from 0 to 90 degree angle by twisting it can be started in to both pipes at the same time at an angle, then twisted to straight configuration to sleeve tightly into both above and below ducting. You do NOT want a loose joint connection just because both ends are already in place. c) Third harder way - make up a custom piece of ducting cut and crimped to fit properly but with edge seam disconnected, slip into female mating end and seal, then wrap around male end and then fit together into a duct piece by closing it up along the crimped longitudinal seam. (You can buy duct material pre-crimped but not formed into a round duct, to custom-make any length you need).

It is best on microvents for all seams to be sealed with seam sealer (for permanent joint) or latex caulk (for removeable joints) as they are assembled (some use duct tape on the male end as it is assembled, as a gasket), and then fastened with sheet metal screws at 3 or 4 points around the circumference, then at least double and preferably triple wrapped with metal foil duct tape which is then metal clamped or stainless wire tied to prevent unravelling when the glue loosens up on the tape (and ALL brands will lose glue adhesion after about 10 years or less in an attic). Then insulation over that if needed.

If the roof hood and duct into the hood is in place, then assuming there is decent access some good duct tape, wire, metal shears, seam sealer or caulk and a tape measure and putting the ducting in place is not a technically tough (though is somewhat physically tough in normal low clearance attic) DIY job - other than working in the attic and having to worry about hot or cold attic conditions and keeping your head and back from being perforated with the roofing nails or screws poking through from above. Lts of DIY videos on Youtube and several manufacturer sites.

BTW - more on condensation and dripping from kitchen fans and solving that here -

Answered 3 years ago by LCD



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