high CFM ventilation, best solution for residential?

[whatthe215]

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[OldSSSCGuy]

Its better for your attic at least. Stops dumping humidity up there.

 

[RM - aquagrower]

how's that sound?

I think that will sound like a jet airliner preparing for take-off without some creative (duct muffler) solutions incorperated into the duct run.

 

[ak-51]

You could oversize the in-line fan and then turn it down a little bit with a variac or speed controller. In my experience, the noise decreases exponentially quicker than the fan speed, so turning it down a little bit yields a large cut in noise.

 

[whatthe215]

hahah noise is not the issue. i meant hows that sound like is it a viable option?

 

[huarmiquilla]

howdy

how you do?

indeed much variance with respect to ventilation
perhap you enjoy to research within analysis such and such ostberg website with respect to such
http://in.ostberg.com/ventilation/

am keen to think with respect to you unique climate such form to being efficent depend much within such context

positive vibrations

 

[RM - aquagrower]

hahah noise is not the issue. i meant hows that sound like is it a viable option?

Here is a post I made to another thread where a guy is planning on venting thru his attic.

Howdy Lyry, I'd be glad togive ya a hand.

The conditions you're describing in the attic what is known as an "open attic". This is where the attic floor is insulated, and the attic is ventilated.

The IRC (international residential code) calls for a MINIMUM of 150 "net free inches" per 100 sq ft of attic floor space with at least half coming from the eaves. Shingle manufactures recomend 300 per 100 sq ft attic floor space. Please remember that this is in "normal" situations.

As for if is a good idea to vent the grow up there, there are some variables, so I have some questions for ya. I've never been to Cali, so how is the average climate? How hot in the summer, how cold in the winter, average RH? Also, how's the condition of the house? Newer windows/doors and well insulated? Or a drafty old farm house? Natural gas heat and hot water?

Ya see, if you vent the "conditioned" air thru the grow, new air must get in to the home to replace what's leaving via the grow's ventilation system. Remember that air follows the path of least resistance.

Tightly sealed house, NG furnace and hot water, and the grows vent system will pull fresh air from the chimney (or metal heat stack) into the home to replace what's leaving. This can lead to corbon monoxide poisoning.

There are also issues with condensation in colder weather. I have been in lots of attics with improperly vented bathroom fart fans. Fan just blowing into the attic space and not vented thru the roof via a damper vent.

Problem usually goes un-noticed 'till time to sell the house. Home inspecter notes mold issues and seller must correct them to close. In some situations, all that is needed is a "mold treatment". Other times roof decking must be replaced. This can get expensive. And this is just venting a bathroom.

I have always grown in basements, so I've never vented into an attic. But if I did, I would set up a "duel" exhaust system with a damper.

One leg of the exhaust line would vent thru the roof, while another vented into another room of the house. A damper would allow me to decide where the grow's exhaust goes. Decision would be made according to outside temps. If it is hotter outside, vent thru roof. If it is cooler outside, vent into another room.

Home depot sells "manual" duct dampers for less that $10. Would require going up into the attic to change. Moterized dampers are also available and could be hooked to a thermostat to handle the change automatically.

As mentioned above, gotta beware of neg air preasure in the house when going thru the roof.

RM

Hope this helps.