Showing results 251 - 300 of 578
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Metal drain pans under HVAC equipment can corrode over time, especially in humid environments
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Most residential heat pumps are installed incorrectly and with energy-wasting faults.
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National Fuel Gas Code (NFPA 2012) identifies four categories for combustion furnaces and water heaters based on combustion type (sealed or unsealed) and vent pipe temperature
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National HVAC Design Report - Cooling Equipment Selection (Version 3 / 3.1 (Rev. 09))
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Non-hardening removable putty can be used to seal around wiring holes in the HVAC cabinet
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Packing tape has been removed and damper will be able to function properly once fan is installed
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PEX piping loops are laid before the slab is poured for this radiant floor heating system
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Placing both interior and exterior HVAC units on an elevated surface provides greater protection against flooding.
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Portable air conditioners offer flexibility with where they are located, but usually need to be installed near a window as they require one or two intake/exhaust ducts connected to the exterior
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Preconditioned outdoor air is supplied to the corridors on each floor of a multistory multifamily building, pressurizing the corridors and providing make-up air for the elevator shaft, which is depressurized by an exhaust fan.
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Prescriptive Path: Supply ducts in unconditioned attic have insulation ≥ R-8. Performance Path: Supply ducts in unconditioned attic have insulation ≥ R-6
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Pull the insulation and outer liner of the flex duct over the collar to come in full contact with the liner and insulation of the trunk line or fitting and tape in place
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Quality installation and commissioning are critical to optimizing heat pump performance.
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Rater-measured duct leakage to outdoors ≤ 4 CFM25 per 100 sq. ft. of conditioned floor area
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Rater-measured ventilation rate is within 100-120% of HVAC contractor design value (2.11)
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Replace HVAC air filters regularly to protect the equipment and maintain system efficiency
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Right - A durable, vented cover is installed over this exhaust duct to prevent bird and pest entry
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Right - A hand saw is used to remove wall material for a small through-the-wall HRV; 6 of 14.
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Right - A hole is drilled into the wall for installation small through-the-wall HRV; 5 of 14.
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Right - A small through-the-wall HRV duct is installed in an exterior wall; 7 of 14.
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Right - A stand-alone dehumidifier is located in the return air closet of this multifamily dwelling located in a humid climate
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Right - All seams in the HVAC equipment and ductwork are sealed with mastic; because the HVAC equipment is in the garage, it is an air-sealed closet.
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Right - An EPDM gasket is installed around an HRV duct installed in an exterior wall; 9 of 14.
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Right - An ultra-efficient (COP 5.7) ground source heat pump provides hot water to an air coil in the central air handler which uses a variable-speed electrically commutated fan motor to distribute conditioned air to the home’s ducts.
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