Most other solutions drastically reduce exhaust velocity and some actually force the exhaust down where it can linger build up and get drawn into hvac or fresh air makeup systems.
No loss exhaust stack cap.
See i said you explained it better.
The over lap between the cap section and main stack only needs to be 6 inches.
Any fume hood mechanical system without one is incomplete.
No loss stack head provides weather protection while it eliminates back pressure on the fan.
This configuration is based on the principle that rain falls at an angle.
Nordfab stackheads are designed to be used when exhausting fans or stacks through a roof.
So if the main stack is 12 inch diameter you should use a 54 inch section of 14 inch diameter for the cap.
Unmatched quality and customer service no other duct manufacturer understands more about putting a working duct system together tailoring it to the customer s current and future needs communicating how to install it then manufacturing it correctly and delivering it on time.
No other stack termination will give you the positive effects for pollution control that the no loss stack head will.
No loss stackheads protect exhaust fans from weather increased resistance causes the fan to use additional power to maintain the calculated cubic feet per minute cfm rate required for the system.
The inner stack is surrounded by an outer stack with space between the two.
Now available in galvanized aluminum stainless and stainless with optional no.
To correct this the central exhaust duct is surrounded by the larger duct of the no loss stack and extends up higher than the central duct and is.
Stackheads eliminate back pressure on the fan while providing weather protection.
4 times 12 48 plus the 6 inch overlap 54.
Sometimes the termination can even be turbulent enough to compromise the exhaust system.
A zero pressure weathercap can save the day.
You will see that the assembly is made up of two pipes.
The exhaust source is offset from the stack and drainage features in the stack direct any water flow away from the exhaust source.
And the cap length should be 4 times the diameter of the main stack.
Losses associated with them may also have other system effects no loss stacks stack diameter d 1 stack height 4d 6 d duct diameter maintain discharge velocity of 3 000 fpm weather cap no loss stack d.
The contaminated air will continuously meet with resistance at the end cap quickly resulting in corrosion of the ductwork and a tumult of eddying fumes.
Flanged end provides for wire guide security.
