Hvac Flex Duct Installation Guide

But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b.

Hvac flex duct installation guide.

Push the core so that it covers at least 1 or 2 inches of the plenum or collar and wrap two rounds of duct tape. To prevent problems use saddles or straps to support at regular intervals 4c 4d follow the manufacturer s instructions but in case they get lost here is a list of best practices for. Bob s not a fan of flexible heating ductwork. Why worry about mold mildew and allergens infiltrating your home through your hvac ducting.

We have talked about ducts being a channel from your hvac system throughout your home. Design the flexible duct system per the requirements of acca manual d residential and manual q commercial. Guidelines for installing flexible duct i n s t a l l a t i o n i n s t r u c t i o n s n o n m e t a l l i c a i r d u c t s a i r c o n n e c t o r s w i t h p l a i n e n d s u l 1 8 1 l i s t e d u n d e r f i l e m h 9 5 9 6 9 8 4 4 a p p l i c a t i. Both types of ductwork have specific features pros cons and specifications.

Flex duct installation we install a lot of hvac systems on martha s vineyard ranging from mini splits to fully ducted. You ve heard about indoor air quality iaq. Flexible duct needs to be larger than pipes to allow the same amount of airflow. On the ducted projects we use flex for the branch runs to the supply boxes.

Flexible ducts and achieve the designed air delivery performance. Rigid and flex ductwork. Whether you re building or remodeling our innovative antimicrobial flexible duct products will help you breathe easier. Properly take into account duct length bend.

Now there are two major types of air ducts that you can choose depending on what you want and need. The 25 page guide begins with a description of the classifications and characteristics of flex duct then discusses how they re tested listed reported and certified. Use a proven method of duct sizing one that has taken into consideration both friction and dynamic losses. Insulated flexible duct flexibility is an advantage when installing in obstructed areas light density fibrous glass insulation fibrous glass insulated hvac duct systems 5 fibrous glass insulated flexible ducts flexible ducts insulated with fibrous glass are an efficient economical way to install connections between trunk.

Chapter 4 is where the meat of the manual is the installation details and that s the part i ll talk about here. These are rigid ductwork and flex ductwork. Installation of flexible ducts shall be listed and labeled to standard ul 181b. There s no question that flexible duct is easier to install than metal ductwork but consider this.

We keep those flex runs short on the order of 5 to 15 feet. It collects dust and is almost impossible to clean.