What does SMACNA stand for?
The Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA) creates multiple standards and technical manuals, addressing all facets of the engineering, construction & HVAC sheet metal business, from duct construction and installation to air pollution control and energy recovery.
What is a splitter damper used for?
Splitter damper hardware is used there’s a main rectangular duct line that splits into two other duct lines; the splitter Damper is in the main duct line and is used to close off one of the other duct lines or to reduce the flow into one of them.
Is a volume damper the same as a balancing damper?
A damper in an HVAC system, also known as Duct Damper or Volume Balancing Damper is a movable plate, situated in the ductwork that regulates the flow of air and redirects it to specific places of a house. The usage of dampers is typically seen in zoning or zone control systems.
What is the maximum aspect ratio allowed by SMACNA?
SMACNA has advised to provide a suitable aspect ratio to be maintained to a maximum of 4. ie. Duct length X width to be lesser than 4.
What is the latest edition of SMACNA?
fourth edition
(October 12, 2021) — The Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA), has published the fourth edition of its “HVAC Duct Construction Standards – Metal and Flexible.” Building on a history of duct construction standards nearly 100 years old, this fourth edition represents the state of …
What is SMACNA Seal Class A?
SMACNA and Mastic on Rectangular Duct Class A applies to static pressure of 4″ wg or more and requires all transverse joints, longitudinal seams and duct wall penetrations to be sealed. Class B applies to static pressure of 3″ wg and requires all transverse joints and longitudinal seams be sealed.
When was SMACNA founded?
Established in 1950, SMACNA St. Louis serves member contractors and experts in four core industries across the greater St. Louis area: architectural, HVAC, industrial and residential.
How many SMACNA pressure classes are there?
three classes
SMACNA breaks down the sealing of commercial ductwork into three classes: A, B, and C. Class A applies to static pressure of 4″ wg or more and requires all transverse joints, longitudinal seams and duct wall penetrations to be sealed.
What is acceptable duct leakage?
The 2009 IECC limits the leakage to outdoors to less than or equal to 8 cfm per 100 ft2 of conditioned floor area or total leakage less than or equal to 12 cfm per 100 ft2 of conditioned floor area.
How do you adjust automatic dampers?
To adjust the damper lever, you will need to turn it to the left or right. If you want to close the damper, you will need to turn the damper lever in the opposite direction of the duct. If you want to open the damper, you will need to make sure it is running in line with the flex duct.