Heat?

[Brian E. Kelly]

Quote:
Originally Posted by dvalley
Charley,When I seen your numbers, it changed my mind.

Originally Posted by roconnor
Good call ... it gets sticky ... --

That is pretty much why my anemometer is collecting dust somewhere.

[David A. Andersen]

http://www.ambientweather.com/newke30powim.html

This one does the most for the $. And is real small. And it's certified.

As far as doing math, for residential stuff you can get a square to round boot in the three sizes commonly used and all you have to worry about is the outlet size of the boot. All that averaging creates too big or an error factor.

[Brian A. MacNeish]

Originally Posted by dandersen

http://www.ambientweather.com/newke30powim.html

This one does the most for the $. And is real small. And it's certified.
By whom??? LOL

As far as doing math, for residential stuff you can get a square to round boot in the three sizes commonly used and all you have to worry about is the outlet size of the boot. All that averaging creates too big or an error factor.

Are you using "net free" areas of the registers as given by manufacturers in your calculations?

[Mark Jones]

This might sound to simple but, Is the bedroom door open or closed. If the door is closed and the gap at the bottom of the door is small the pressure in the room may get higher or equal to the air being pushed into the room alla no warm air gets into the room. My teenage daughter use to complain about this problem and thought I was nuts untill she started sleeping with the door open.

[David A. Andersen]

I use the TAB protocol from SMACNA.

And neither do I do any of this in a home inspection. I do measure ft/sec supply air (if I can't feel good flow) and returns if they are loud. Air flow below 300 ft/sec generally does not have the throw or capacity to heat/cool the room. We use a lot of heat pumps here so velocity expectations can be higher.

I just SWAG it for the most part. I can tell when things are not right.

I also use my IR. Air throw patterns. Air stratification ect...