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Ducts
DUCTS FAQ
What is Flexible Insulated Duct?
A flexible, tubular passage, for supply, return and exhaust air used in heating, ventilation and air conditioning systems. It can replace galvanized pipe and helps reduce heat and cool loss as well as condensation build-up.
How are the types of Flexible Insulated Duct classified?
Flexible insulated duct can be classified into 2 categories: Air Duct or Air Connector.
What is an Air Duct?
An air duct is a category of flexible duct that has been tested and classified by the surface burning characteristics in accordance with the UL 181 standard. An Air Duct can be identified by the rectangular shape label that the manufacturer applies to the duct
Why are there two types of jacket – Black and Silver?
The jackets are vapor barriers. The vapor barrier is the outer membrane of the flexible insulated duct. For a stronger more durable vapor barrier your choice should be silver jacket as it is heavy duty, tear resistant and has a reinforced scrim.
What is the temperature range for Flexible Insulated Duct?
-20°F to 250°F
How do you install Flexible Insulated Duct?
See attached installation instruction sheet per the Air Diffusion Council. Website www.flexibleduct.org
Notes:
- Avoid installations where exposure to direct sunlight can occur i.e. turbine vents, skylights etc. Prolonged exposure to sunlight will cause degradation of the vapor barrier
- Repair torn or damaged vapor barrier jacket with duct tape listed and labeled to UL 181 standard
- Install duct fully extended. Do not install in compressed state or use excess lengths
Approved joining materials include: ½” wide aluminum, galvanized or stainless steel clamps, nylon ties for low pressure systems (2” W.G.) or tapes listed and labeled in accordance with UL181B standard and marked 181B-FX
How do you connect pieces of duct together?
All connections, joints and splices shall be made in accordance with the manufacturer’s installation instructions. General guidelines include:
- Peel back jacket and insulation from core. Butt two cores together on a standard 4” metal sleeve.
- Tape cores together with at least 2 wraps of duct tape. Secure with 2 clamps.
- Pull jacket and insulation back over cores. Tape jackets together with at least 2 wraps of duct tape.
What is an R-Factor?
R-Factor is the thermal resistance. A higher R Value represents a better insulating material. The minimum value is R4.2. The R Value requirements for air distribution ducts can vary depending on the energy code being enforced.
What are the available R-Factors?
Dundas Jafine offers Flexible Insulated Duct with R Value ratings of 4.2, 6.0 and 8.0.
Where would I find the R-Factor?
Dundas Jafine prints the R-Factor on the end flaps of the carton packaging, on the vapor barrier (jacket) of the duct as well as on the Air Duct identifying UL label that is applied to the duct.
What appliances are not recommended for Flexible Insulated Duct?
Air ducts and air connectors should not be used to vent any appliance for cooking, heating or clothes dryer venting unless approved and recommended by the appliance manufacturer.
What is the temperature range for Flexible Aluminum Duct?
-100°F to 435°F
What is the R-Value of Aluminum Duct?
Uninsulated duct does not have an R-Value rating.
How can I extend the semi-rigid aluminum duct to its maximum length?
The best way to extend the duct is to have a person pull from each end of the duct while slightly twisting counter clockwise. Ensure you are holding onto the duct itself and not any collars that may be attached.
Can additional pieces of the aluminum pipe be added together to form a longer duct?
Additional pieces can be added to form a longer length. However, is being used for dryer venting purposes, the ducts should be taped together as screws can cause a lint trap.