Convert dryer vent to range hood vent?

Discussion in 'HVAC Heating & Cooling' started by petergunn, Nov 8, 2009.

  1. petergunn

    petergunn New Member

    Messages:
    26
    I recently replaced my gas dryer with an electric condensing washer/dryer combo unit so I have an external vent (3.5" vertical) in my apartment that I no longer use.

    Assuming it was appropriately cleaned could I use it to vent fumes from a range hood?

    I believe the current recirculating microwave hood (GE XL1800) can be adapted for external venting. I would need about 10ft of ducting with 3x 90 degree turns to reach the vent. Would an additional blower also be required somewhere?

    Just brainstorming...

    PG.
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Assuming your vent pipe is 4" diam. that is a little small for a range hood, but would be better than nothing.
  3. petergunn

    petergunn New Member

    Messages:
    26
    Yes, 4" metal duct. I'm on the top floor and travels what looks like 4-5 feet vertically through the roof.

    I found a PDF online for that suggests the hood is capable of handling up to 140ft of duct (with 10 feet deducted per 90 degree bend) but requires 6" diameter ducting. So I guess I'm stuffed.
    Last edited: Nov 8, 2009
  4. Ian Gills

    Ian Gills Senior Robin Hood Guy

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    Location:
    USA
    I'd be tempted to put a reducer on that, given that it's just a range hood.

    I'm stuck with carbon filters.
  5. Hube

    Hube New Member

    Messages:
    156
    Location:
    Ontario
    huh!!! Why on earth would you suggest putting a REDUCER on a vent that already is not as large as it should be???

    actually in my opinion, this 4" vent could do ok to some satisfaction depending on the size of the fan that will exhaust this range hood air.
  6. jimbo

    jimbo Plumber

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    8,997
    Location:
    San Diego

    I think he just means a reducer to match the outlet of the hood to the 4" duct.

    I agree that exhausting through the 4" is preferable to his current non-vented situation. It may be a little loud, and not move as much air as designed, but I still think better than not.
  7. Gary Swart

    Gary Swart In the Trades

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    7,396
    Location:
    Yakima WA
    How hard would it be to enlarge the hole(s) where the 4" vent is and put in a 6"?
  8. 1. Never add "an additional blower "
    2. "Apartment" = tell your landlord everything
    3. Ten feet and three elbows and a 4" duct = an insufficient flow; you will not be satisfied OR you will have had some fun trying something out; the next occupant after you will not be satisfied.

    Brainstorming is good. Be sure about what you later implement.
  9. Code does not allow mixing/combining kitchen exhaust vents and dryer vents, in buildings of a certain size -- which you as an apartment dweller may be living in. Most likely. I don't know what size building it starts at.
  10. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,317
    Location:
    New England
    While you may no longer need the dryer vent, the next occupant of the apartment may, so it's not a good idea to retask it. even though the filters on the range hood trap most of the grease, they still let a little through. The more elbows, the more chances of that grease accumulating. Grease is worse than lint, and a grease fire is a possibility. If I was the landlord, I'd not approve that. Now, depending on where a new vent might be put, I might consider venting the range hood out on a shorter, more direct path, especially if the tenant was willing to pay for it.

    Some things can be done in your own home, but an apartment is much more restrictive. It's generally, what you see is what you get.
  11. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Messages:
    1,328
    Location:
    Columbus, OH
    Not to mention the next tenant's lint is going to stick to the grease and it will be a mess (if it doesn't catch on fire).
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