Table of Contents
How do you attach a flex duct to rigid?
Is flex duct plenum rated?
Flexible air ducts and air connectors do not have “plenum ratings” similar to those for wiring and plumbing pipe. The requirements for materials allowed within plenums is covered in NFPA Standards 90A & 90B and the applicable Mechanical Codes (IMC, UMC).
What UL 181?
UL 181 is a requirement applying to materials in the fabrication of air duct and air connector systems. The differences between an air duct and air connector lie in the testing they undergo by UL and as a result, the allowed uses by code.
How thick is the insulation on flex duct?
Thermaflex provides insulated flex duct with three different R-Values (4.2, 6.0, and 8.0). The thickness of each is: R-4.2 = 1.25˝ (Owens Corning).
How do you support a flex duct in a crawl space?
Support flex duct using straps or saddle supports or as specified by the manufacturer. Space supports at 4-foot intervals or closer to ensure that the flexible duct does not sag more than 1/2 inch per lineal foot between the supports. Place supports at each connection between flex duct and rigid metal duct.
Can you split an air duct?
Splitting a duct will reduce the efficiency of conditioning that space. You will need to know if the HVAC system has enough CFM Flow for the addition to begin with. Ideally it would be best to run a line direct from the main box coming from the HVAC unit.
Can I tap into existing ductwork for basement heat?
Here are a few popular heating options for your basement: Extend Your Ductwork: Tapping into your existing heat and air conditioning system will provide the basement with reliable heat and prevent you from having to maintain separate heaters.
What is FlexFix tape used for?
Description. FlexFix™ UL181B-FX Film Tape is a tough, contractor grade closure system for Class 1 flexible air ducts and connectors, sealing reflective and bubble insulation and suitable for metal to metal connections in HVAC and refrigeration applications.
What is UL listed tape?
UL Listed foil tapes are used to seal air duct and air connectors and have been stringently tested for flame resistance, mold growth and humidity, static load, impact, pressure, collapse, tension and more.
What is UL tape?
UL Listed Tape Products and UL Recognized component materials are typically used for insulating and shielding applications. Common UL materials include Adhesive Transfer Tape, Duct Tape, Glass Cloth Tape, Foil Tape, Foam Tape, Polyester and Polimide Films.
Can you insulate flex duct?
Air seal and insulate flex ducts. Install flex duct that is pre-insulated with a layer of fiberglass blanket insulation covered with a foil or plastic vapor barrier. Use insulated duct for all supply and return ducts located in unconditioned space. Meet code or program minimum R-value requirements.
What type of insulation is used for ductwork?
The most common material used for insulating heating and cooling ducts is fiberglass. Fiberglass duct insulation is available in various thicknesses and R-values and in either a flexible or rigid form.
What’s the difference between R6 and R8 flex duct?
R8 ducting uses thicker insulation than R6 ducting. This means that if you were to do air conditioning installation using R8 ducting, you get better insulation than if you are using R6 ducting. When it comes to efficiency of heat insulation R6 ducting is less efficient than R8 ducting.
Should flex duct be suspended?
Ideally, all ducts should be located within the conditioned space. When flexible ducts are located outside the conditioned space, they should be sealed to prevent loss of conditioned air and also insulated to prevent thermal loss or gain from the ambient air.
What is the max recommended length of flexible duct?
Flexible air connectors which are listed to UL 181 are allowed by the standard in lengths up to 14 feet. This product is specifically evaluated for the maximum length up to 14 feet, and the manufacturer’s installation instructions are reviewed to ensure proper installation up to this length.
What is a transition duct?
The transition hose, also known as the transition duct, is the short length of dryer vent connecting your dryer to the vent line that runs through your wall to the outside of your house.
What is a transition HVAC?
Biyang Duct Transition, also called Duct Connector is a critical and indispensable part of HVAC ductwork. It connects the different sizes of ducting, different parts of facilities, and different materials of ventilation components together to ensure the smooth and steady air flow.
Should return air vents be high or low?
For optimal efficiency, it’s ideal to have return registers installed. To ensure efficiency during the cooling season, your home should have high registers. High return registers draw hot air that rises to the ceiling back into the system to repeat the cooling cycle.
Do I need a disconnect for air handler?
An on-off switch is all that is required for this location and application by electrical codes. Typically separate circuit breakers (or fuses) power the compressor/condenser unit and the indoor air handler/blower assembly.
What’s the difference between a furnace and an air handler?
The difference between an air handler and a furnace is that a furnace creates and moves heat. An air handler moves air heated (or cooled) by another source. Air handlers and furnaces are heating and cooling appliances that look very much alike. Their function is similar too.
How do you cut an existing HVAC duct?
Cut flex duct with a utility knife or shears and tin snips. Slice the metallic outer layer and the insulation around the round flex duct with the knife or shears and lay it back to expose the coiled wires. Cut each wire with snips, taking care to make the cuts even so the cut end is straight.
