How bad on average does a "TEE" affect your draft?

[tlhfirelion]

If your only option is to use a "TEE" in a thru the wall application, does it greatly affect it, slightly, or what? I know it'a hard to put a number to this question as in 25% worse, but I've heard form a few guys who know their stuff it hurts it but not how bad.

Thanks in advance.

 

[BrotherBart]

Guidelines for gas appliaces is 5% reduction for a 45 degree elbow and 10% for a 90. I have seen 15% for a 90 degree used here over the last couple of years talking about stove flues.

 

[stoveguy2esw]

a TEE is nothing more than a 90 degree elbow wiht a cleanout. it will not affect any appliance any more than an elbow would

 

[tlhfirelion]

thanks guys, thats not near as bad as I was thinking.

 

[Backwoods Savage]

We have a through the wall installation then a tee (for cleanout). Have always used this with no bad effect as long as there is a cover on the bottom of the tee. As stated, it is like a 90 degree elbow. We figure to add 2-3' of chimney for every change of direction.

btw, on through the wall chimney, make sure you have a minimum of 1/4" rise per foot. We have 1/2" rise per foot. Otherwise the smoke just does not want to go out. Smoke needs to go up.