: Shop Exhaust Vent


Todd W
05-18-2009, 06:18 PM
So I've seen a lot of shops and garages with vents on the side of the building either with a fan or just the vent that opens when hot air goes out.

Do they make something like this yet nicer I can utilize inside my house?

My office was an addition and has tall vaulted ceilings and at night I'd love to switch on a fan and suck all the hot air right out the top and allow the cold air to come in a lot easier.

Eventually we`ll add a WHOLE house fan, but the office has no attic space, so I can't put a smaller/seperate one in here.

This room is almost 400sq/ft so it's not tiny, especially with the tall ceilings a lot of hot air likes to hangout.

Pavemen
05-18-2009, 08:51 PM
I've been looking at some myself for the garage, but none that are decent looking. You'd need to trim it out yourself to look nice.

For my office, I broke down and bnought a 14,000 btu portable A/C, heater, dehumidifier, fan combo unit. I comes with a window exhasut kit, but I put a dryer vent from the office into the garage and it works great that way.

Todd W
05-18-2009, 10:29 PM
I've been looking at some myself for the garage, but none that are decent looking. You'd need to trim it out yourself to look nice.

For my office, I broke down and bnought a 14,000 btu portable A/C, heater, dehumidifier, fan combo unit. I comes with a window exhasut kit, but I put a dryer vent from the office into the garage and it works great that way.

I have a 10,000 BTU unit in here. But at night, like now, it's in the high 60s outside and 80* in here still :shaking:

I just need a way to get the hot air up there out!

I have a ceiling fan, I guess I should get installed and running.

randii
05-19-2009, 02:56 AM
If you still have that yellow inline fan, Todd, I bet it would work GREAT for this.

Whole-house fans come up on Craigslist for reasonable bucks from time to time (probably the wrong season now, since everyone else is hot!), and there are wall versions of the same, but I have not seen them cheap enough per CFM to move me off the idea of a used whole-house fan. In the meantime, I just use my air movers to turn over shop air quickly....

Randii

CPOM
05-19-2009, 10:02 AM
Just put a box fan in a window blowing outwards on High for a few minutes when it's cooler outside than inside.

If you want something nicer, get a dual window fan.

CJHeap
05-19-2009, 10:15 AM
some builders set up bathroom exhaust fans to act as air exchange units by installing a timer. They have timers that fit a single gang box.

So, install a high CFm bathroom exhaust fan and hook it up through a timer.

Todd W
05-19-2009, 12:03 PM
If you still have that yellow inline fan, Todd, I bet it would work GREAT for this.

Whole-house fans come up on Craigslist for reasonable bucks from time to time (probably the wrong season now, since everyone else is hot!), and there are wall versions of the same, but I have not seen them cheap enough per CFM to move me off the idea of a used whole-house fan. In the meantime, I just use my air movers to turn over shop air quickly....

Randii

I have 2 of those 2400cfm fans :smokin: One I used to blow out drywall dust when working, and we had some black mold, so that one isn't coming back in the house haha. The other is at my folks place down in the valley, I plan to get that up here, and make a cut-out for it for an upstairs window and use it to pull air up through the house. I think whole house fans are less than that, so it work nicely.

Just put a box fan in a window blowing outwards on High for a few minutes when it's cooler outside than inside.

If you want something nicer, get a dual window fan.
I have been doing this, my window has a 10" ledge, I have used a big fan, and I use dual window fans upstairs (I have 3), and they work great for blowing cool air in, not so great for creating any type of pressure or sucking air out, they're just too weak for this. But they work great for cooling upstairs bedrooms quickly :)

some builders set up bathroom exhaust fans to act as air exchange units by installing a timer. They have timers that fit a single gang box.

So, install a high CFm bathroom exhaust fan and hook it up through a timer.

Now there's an idea! I`ll have to look into this.


I also may play around with a cooling element and using my basement temps to cool down the office. It seems to stay in the mid to low 50s in there even when its in the upper 80s outside :D

Todd W
05-19-2009, 12:06 PM
I`m looking into whole house fans too...

Anyone know of any high quality ones? I want to move at least 2500cfm.

A house I rented 3 years ago had one with two speeds, and on high that fucker was amazing if you only opened one window and stood next to it, felt like 20mph wind!

What are things to look for, and / or good brands?

Todd W
05-19-2009, 12:14 PM
There is a simple way to determine the size fan you need for your house. Assuming you have standard eight foot ceilings, simply multiply the total square footage of the finished living space of your house by three. This number represents the minimum cubic feet per minute that the fan must push. Simply purchase a fan that has a CFM rating equal to or greater than the number you calculated

Good lord :laughing:
2,000 x 3 = 6,000cfm. And that doesn't account for the vaulted ceilings in the office, or vaulted ceiling my stairway. So, we`ll say 6500cfm :eek: :eek:

I haven't seen any 6000cfm fans so I`m gonna guess that math is not exactly right.

I've seen some "dual fan" 4500cfm.

The other issue would be exhausting from the vents, and whirly birds... can yo imagine 4500cfm my whirlybirds would probably spin right off and go flying.

It looks like some of the nicer house fans actually have exhaust systems so you can install a new vent on the side of your house for that air only... this looks like something I could do since I have tons of attic space, and then it wouldn't screw up my whilry birds l o l.

Todd W
05-19-2009, 12:19 PM
Found one: http://www.thehardwarecity.com/getProductDetail.html?sku=5804422

# SIZE:36"-6,900 CFM
# FOR HOMES:To 2,300 sq.ft.

36" is pretty large, I don't even know if Ihave that much ceiling space in my hall upstairs.. that would require some joist reinforcement/arrangements too, if it doesn't sit on top them? Hmm.