Make-up air

[REKIII]

I did a little searching on this and couldn't find anything on equipment.

I have a 2400sqft shed that I sprayed foam insulation into. I left the truss's open so every sq in of interior surface (minus the floor) is sealed.

I think though I'm going to need to put in an exhaust fan/ make up air unit to keep the pressures equalized with outside and to be able to get rid of noxious fumes from welding, etc.

Can anyone point me in the right direction? Some units to research?

Thanks!

 

[Farmall Cub]

If you are sealed that tight and want to use a fan, you will have to have a set of louvers equal to the fans CFM.
Also, if you put in any kind of flame heat it will need combustion air. With this, you may have to use a small actuator to open the louvers when the heat fires up. Or, buy cheaper louvers that don't seal all that tight.

 

[nadogail]

If you draw your combustion air from outside the heated space your system will be more efficient.

 

[REKIII]

When I install the permananet furnace it will be a horizontal high efficiency, so cumbstion air wont be an issue. This is more for getting out fumes and such.

 

[REKIII]

Bumping this. Still looking for something.

Thanks!

 

[bigdav160]

When you install the furnace, install a small intake duct (with pre-filter) from the outside.

Running the furnace, or just the fan, will positive pressure your building. It'll act, somewhat, like an evr for your make up air. If you place a vent hose from your welding table to the outside, the positive pressure should push the fumes out.

 

[roscoe2000]

Try Dayton, they manufacture intake, exhaust fan and dampers.

 

[DC73]

Serious home chefs install large exhaust vent hoods over the range that are tied to an electric damper for air intake. When the vent hood is on, the damper opens to bring in fresh air.

DC

 

[sixty4]

Do a search on fan in a can.

 

[ambenz]

What you ever decide to do, keep it simple...maintaining a complex system can be costly in the long run.

Dedicate a zone for exhausting and supplying.

If you need a more complex system, be prepared to pay.

 

[REKIII]

Thank you for some good options and ideas. I'll have to figure out how well I want it to work.