Another vent hood mua question: please help

rovoApril 22, 2013

Hello all: I have done my best to weed through the complex vent hood/make up air threads, and while I know codes vary by many factors, not the least of which is location, I am hoping for some general guidance here. My advanced apologies if this has been answered in previous threads; if so, I cannot find them or make sense of them :(

I have what I consider to be a relatively simple situation: small kitchen, budget DIY refresh with removal of useless OTR microwave that we want to replace with a vent hood. We have existing 7" venting that routes horizontally approximately 2 feet through the dreaded soffits and then up through the roof on our one story home. All we want to do is put in a vent hood we purchased, rated at 670 cfm's, or at this point, ANY vent hood to meet our meager needs. No wok frying, totally average (47k btu) Bosch gas cooktop with electric oven. One gas fireplace within the "open concept" kitchen/nook/family room combo; gas water heater in garage with simple venting (e.g. opening in garage walls with vents to the outside), furnace in attic, two underpowered bathroom fans. 2300 sq ft home in Northern California built in 1999.

I purchased a chimney style vent hood rated at (670 cfm) via amazon a while back, and did not realize that I could be wading into the mua world. I seriously doubt this hood really moves 670 cfm's, but still want to ensure that it meets code and does not pull co2 into our home. Not willing to get into mua solutions, both from a cost and over-improving standpoint.

I cannot find a single reference to what floor/lowest level cfm fan rating that we would need to avoid mua requirements. As far as i can tell, codes do not list this explicitly, nor was a call to our title 24 energy commission helpful. Apparently, there is some ASHRE calculation one must do for the whole house, but the information is not free and I was advised to consult an HVAC pro.

Willing to consult an HVAC pro, if that is the recommendation here. Or, if any of you GW experts have general guidelines on what the highest CFM rating for a vent hood is in my area, whom to contact, etc, it would be much appreciated. Thanks!

Thank you for reporting this comment. Undo
attofarad

In San Jose, the link below applies. See C.1.

Edit:

Also, this link

http://resaveguide.lbl.gov/step-1-assess-the-home

Here is a link that might be useful: SJ ventilation requirements

This post was edited by attofarad on Mon, Apr 22, 13 at 18:30

    Bookmark   April 22, 2013 at 6:21PM
Thank you for reporting this comment. Undo
rovo

Thank you, great link. From what I gather, I will need to stick to a 300 cfm vent hood, give or take, to avoid MUA requirements. Much appreciated!

    Bookmark   April 22, 2013 at 8:41PM
Sign Up to comment
More Discussions
Need feedback on KOBE Range Hood
Hello! I'm looking at buying a KOBE range hood. The...
bblakeney
DCS double wall oven--reviews?
I'm in the market for a double wall oven and saw a...
anna_chosak
Wall oven caution - IKEA/Nutid/Datid/Whirlpool
This post is meant to steer people away from IKEA Nutid,...
detroit_burb
Difference between advantium and convection microwave
I had almost decided on the ge advantium (monogram)...
athensmomof3
How to decide on refrigeration? High versus low end.
We are a family of 4 with growing kids; cook almost...
acaba
Sponsored Products
Tessa Bronze One-Light Dome Pendant with Bicolor Orange/Pina Glass
$184.50 | Bellacor
Canto Satin Nickel One-Light Halogen Wall Sconce with Bicolor Green and Yellow G
$180.00 | Bellacor
Jardine 3-Tier Chandelier by Kichler
$3,388.00 | Lumens
American Drew Jessica McClintock Couture Splat Back Dining Side Chairs - Set of
$950.00 | Hayneedle
Double Bamboo Cane Accent Lamp by The Natural Light
Lamps Plus
Powell Retro Red Bottle Bar Stool
Overstock.com
s: Innes 70.3 in.-style Mission Torchiere with 14 in. Shade CH33359MR14-TF1
Home Depot
Surya Blinds & Shades Country Living Pale Blue 5 ft. x 8 ft. Area Rug CTJ2022-58
Home Depot
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™