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Frequently Asked Questions

  1. Grilles, Registers and DIffusers
  2. Flex Duct
  3. B-Vent

Additional Articles

December 30, 2013
Slimming Down in the New Year
Hart & Cooley is excited to announce the reduction or elimination of broken case, minimum order and expedite fees.
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December 6, 2013
Working for You: New Stocking Changes for Grilles, Registers & Diffusers
Lima is implementing changes throughout all of our grille, register and diffuser manufacturing plants to improve performance and responsiveness to customers’ needs.
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December 6, 2013
Working for You: New Stocking Changes for Grilles, Registers & Diffusers
Hart & Cooley is implementing changes throughout all of our grille, register and diffuser manufacturing plants
and distribution centers to improve performance and responsiveness to customers’ needs.
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April 1, 2013
What is the required load rating for floor registers/grilles?

Per the mechanical code, the requirement is a 200lb load applied to a 2" disc at the most critical area of a floor register. All of our registers (utility and decorative) meet or exceed this requirement. Our most robust model would be the 210/265 models.

April 1, 2013
What is "Effective Area" or "AK" in the engineering tables?

Effective area, Ak.

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April 1, 2013
What is "Free Area"?

Free area is the total minimum area of the openings in the supply outlet or return inlet (usually in square inches) through which air can pass. Also known as the "see-through area".

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Additional Articles

November 14, 2016
Flex Duct - Call to Comment

Potential Changes to Uniform Mechanical Code (UMC) that could affect Flexible Duct Business.

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Please click to download PDF call to comment letter.

April 1, 2013
Must I use UL-Listed Duct Tape, Mastics and Clamps?

Yes. Our installation instructions are in full compliance with UL and ADC standards.

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April 1, 2013
Are Flexible Air Ducts plenum rated?

Yes. Per the 2006 Int'l Mech Code Section 602.2.1.

April 1, 2013
Can screws be used to fasten flexible duct core?

Hart & Cooley does not recommend screws be used to fasten the polyester core of the air ducts because they weaken the polyester.

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April 1, 2013
Can I use the same size flexible duct as I would use for round sheet metal?

Yes and No. Yes, if the appliance can overcome the increased static pressure and still deliver the required amount of cfm needed to condition the space.

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April 1, 2013
Does Flexible Duct inhibit mold growth?

Yes. Per the UL181 test standard, the flex duct must be inoculated with mold mycelia & spores and inhibit the inoculated area to grow over a period of 60 days.

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April 1, 2013
Can Flexible Duct and Air Connector be used for bathroom/shower exhaust fans?

Yes. We recommend that you use insulated flex duct in longer vent run applications to assist in keeping the humidity from condensing inside the duct and to help prevent the pooling of water, which can damage the core.

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April 1, 2013
Can Flexible Duct be exposed to ultraviolet sunlight?

No, even though our black jacket offering has some inherent UV resistance we do not recommend the use of our product to be used in direct sunlight and cannot guarantee the longevity associated with that application.

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April 1, 2013
What is the difference between AIR DUCTS and AIR CONNECTORS?

Air ducts must pass 15 tests of the UL181 Standard for Safety for Factory Made Air Ducts and Air Connectors.

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April 1, 2013
Can Flexible Air Ducts or Connectors be used to vent clothes dryers?

No. The International Mechanical Code & Residential Code state that "Exhaust ducts for domestic clothes dryers shall be constructed of metal and shall have a smooth interior finish...."

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Additional Articles

June 9, 2016
Shh...Installation tips to keep B-Vent Safe & Quiet

To keep your vent systems noise free, use thesebest practices at the time of installation.

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April 1, 2013
Can I paint my B-vent?

Yes, you can paint exposed b-vent to match the color of the siding or roof shingles.

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April 1, 2013
What causes noisy B-vent?

Often, noise in Type B gas vent is caused by the relative movement of parts in the system with adjacent parts, with part of the structure, or because of additions or changes to the parts and/or system.

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April 1, 2013
Is Hart & Cooley B-Vent Fire Rated?

No, Hart & Cooley's Type B gas vent does not have a fire rating. Neither do any of our competitors.

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April 1, 2013
Can you use sheet metal screws in B-vent?

Generally, NO, Hart & Cooley does not want sheet metal screws used in the assembly or installation of our Type B gas vent.

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April 1, 2013
Can B-vent terminate horizontally?

No. Per the sizing tables, all orientations must terminate vertically with a UL listed rain cap, otherwise the appliance may not vent properly.

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April 1, 2013
What Class or Category of pipe is B-vent?

The Category is actually applied to the appliance.

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April 1, 2013
What are the airspace clearances to combustibles and what are the temperature limits?

1" clearance is required per our UL listing for all installations.

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April 1, 2013
How do I know what size B-vent to use?

Several variables need to be considered to determine the proper size of a venting system.

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