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valcarmo72 02-20-2013 06:41 PM

Range hood exhaust run...
 
I have a microwave oven/ Exhaust fan that is currently set to recirculate the air...which does absoloutley nothing at all. I wanted to flip the fan on the unit but the kitchen is located almost in the center of the house. Therfore I would have to run 18 feet of rigid duct to exhaust the hot air. Is there a max amount of length you can run and also is the normal single wall tin exhaust good enough...? I can't go up because it is on the first floor...only straight across in the cieling with one 90 at the begining of the run...

Thx for the help....

TarheelTerp 02-20-2013 08:32 PM

Quote:

Originally Posted by valcarmo72 (Post 1121286)
...but the kitchen is located almost in the center of the house.
Thx for the help....

What is UNDER the kitchen?

valcarmo72 02-20-2013 08:33 PM

Basement...thought of that but I thought u can only go up and out and not down..

Don't know?...ask someone...

md2lgyk 02-21-2013 07:39 AM

I suspect that like dryers, exhaust hoods have a maximum length for the exhaust run. Probably varies by manufacturer and/or model. But I have a gut feeling that 18 feet is much too long. The exhausted air really isn't very hot, so I see a big potential for grease condensing in the pipe.

TarheelTerp 02-21-2013 07:52 AM

Quote:

Originally Posted by valcarmo72 (Post 1121350)
Basement... I thought u can only go up and out and not down..

Quote:

Originally Posted by md2lgyk (Post 1121560)
I suspect that like dryers, exhaust hoods have a maximum length...
a gut feeling that 18 feet is much too long.

Correct.

Which is where the supplemental exhaust fan comes into play.
LINK

valcarmo72 02-21-2013 08:21 AM

What do mean supplemental...? Like a fan on the closest exterior wall type...?

Don't know?...ask someone...

valcarmo72 02-21-2013 08:40 AM

Inline fans in the duct work? Will it not build up with grease?..

Don't know?...ask someone...

md2lgyk 02-21-2013 12:15 PM

I would've thought so too. But based on the info at TarheelTerp's link, it's apparently OK.

valcarmo72 02-21-2013 03:22 PM

Wow totaly missed the link....LOL. Thx

Don't know?...ask someone...

GBrackins 02-22-2013 04:38 PM

length of vent is determined by the manufacturer. they determine this by the size of the vent and the amount of air the exhaust fan can move per minute. Go on the manufacturer's website and see what they have listed.

Good luck!

hand drive 02-23-2013 11:41 AM

the best exhaust that we used was a roof fan mounted version. totally quiet at the hood when on full blast and pulling all kinds of air, really neat! if trying to pull to much air over a long run of space a supplemental blower will be need to pull the air, grease is part of the system in a kitchen and the fan filters are for the grease- change the filters when needed


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