Showing results 1 - 100 of 578
Image
Individual ventilation systems for each dwelling unit in a multifamily building will require large numbers of penetrations in exterior facades
Image
These schematics illustrate temporary deployment locations for probes during the commissioning process; these probes connect to smartphone commissioning applications.
Image
This central ventilation system uses an energy recovery ventilator to supply air to the corridor and exhaust air from the elevator shaft of a multifamily building
Image
A 5,000- 6,000 Btu/hr air conditioner drawing about 500 watts can be installed in one window of a designated cool room (it is important that the installation is insulated and well-sealed
Image
A central fan-integrated supply system uses a fresh air intake ducted to the home's central furnace or air handler unit to supply fresh air throughout the home
Image
A central rooftop fan supplies outdoor air to all floors of a multistory multifamily building, pressurizing the corridors and providing make-up air for the elevator shaft, which is depressurized by an exhaust fan.
Image
A central rooftop fan supplies preconditioned outdoor air to every 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.
Image
Image
Image
A constant airflow regulator is a modulating orifice that automatically regulates airflows in duct systems to constant levels
Image
A constant airflow regulator is fitted into the neck of the supply duct to control air flow to deliver the design airflow regardless of pressure variations
Image
A cool room should have low enough heat gains to be easily cooled by a small single-zone cooling system such as a mini-split or a window air-conditioner as shown here
Image
Image
A direct-vent sealed-combustion fireplace takes its combustion air directly from outside through a dedicated air inlet and vents combustion products directly outside
Image
A direct-vent sealed-combustion furnace has dedicated pipes for combustion air and exhaust
Image
A duct leakage test is performed on a ducted heat pump system using a duct tester (blower fan) and a digital manometer.
Image
A ducted central return brings air from central return registers back to the air handler through insulated, air-sealed ducts
Image
A flow grid is inserted into the filter grille/slot to directly measure airflow.
Image
A foaming cleaner is used to clean the coils inside this ductless indoor unit; a mini-split bib surrounds the unit to contain overspray and drips
Image
A foaming sprayer and mini-split bib are required to properly clean this ductless wall-mounted indoor unit
Image
A fresh air inlet is ducted to the return side of the home’s central air handler; a motorized damper and electronic controls help balance the flow of fresh incoming air with controlled exhaust to meet ventilation requirements
Image
A ground-source heat pump used a fluid flowing through pipe loops to draw heat from or discharge heat the ground to heat or cool the indoor space.
Image
A high-efficiency heat pump is installed in a closet within this home’s conditioned space.
Image
Image
A modern single-inlet direct evaporative cooler draws outside air through an 8- to 12-inch media filter
Image
A nitrogen pressure test was completed on this ductless mini-split heat pump using a digital manifold gauge.
Image
A nylon draw band and tensioning tool are used to secure the inner coil of the pre-insulated flexible duct
Image
A nylon draw band and tensioning tool are used to secure the inner liner of the pre-insulated flexible duct
Image
A passive air inlet is one approach to providing makeup air when operating an exhaust-only ventilation system
Image
A passive flow hood is used to measure the flow rate of air that passes through a ceiling-mounted exhaust fan
Image
A permanent awning prevents snow and overflowing ice dams from causing damage to HVAC equipment below.
Image
A portable CO monitor is used to test for ambient CO near a ventless combustion fireplace
Image
A properly sized cold climate heat pump can meet 100% of a home’s heating load in nearly any location in the United States
Image
A properly sized high-efficiency heat pump is located in conditioned space in a closet inside the home.
Image
Image
A seismic snubber is a type of bracket specifically designed to anchor heavy equipment to the floor to restrain it in the event of an earthquake.
Image
A single ductless heat pump heats and cools the country’s first DOE Zero Energy Ready certified manufactured home.
Image
A static pressure measurement is taken on this air handler using probes on the supply and return sides of the fan.
Image
Image
A supplemental dehumidifier is integrated with the home’s HVAC air handler to provide extra dehumidification when needed
Image
A technician assembles the spray sealant injection system to seal HVAC ducts from the inside
Image
Image
Image
A vacuum decay test is performed on this ductless mini-split heat pump using a digital micron gauge for accurate measurement; a deep vacuum is achieved quickly by using large diameter, vacuum-rated hoses, and removing valve cores
Image
A ventilation controller with a manual override is located on a central air handler fan that is located in an accessible location
Image
Image
After securing the inner coil, cover the draw band and the seam with a generous amount of mastic
Image
Air flow is produced when central HVAC fan is energized (set thermostat to “fan”)
Image
Image
Image
Air seal and insulate flex ducts
Image
Air seal duct boot to ceiling by installing fiberglass mesh tape and mastic over seam
Image
Image
All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6
Image
All return air and mechanically supplied outdoor air pass through filter prior to conditioning
Image
An air vent mounted high on the radiator will shut quickly and limit the radiator’s heat output
Image
An air vent mounted low on the radiator will allow more steam to enter the radiator before it shuts
Image
Image
Image
An energy recovery ventilator (ERV) transfers both heat and moisture between incoming and outgoing streams of air
Image
An Energy Recovery Ventilator provides outside air to this dwelling unit; a range hood with dedicated makeup air provides local kitchen exhaust; a Packaged Terminal Heat Pump provides conditioned air and dehumidification is provided separately
Image
An Energy Recovery Ventilator provides outside air to this dwelling unit; a range hood with dedicated makeup air provides local kitchen exhaust; a Packaged Terminal Heat Pump provides conditioned air
Image
An Energy Recovery Ventilator provides outside air to this dwelling unit; a range hood with dedicated makeup air provides local kitchen exhaust; a radiant heating system provides heating
Image
Image
An independent ducted dehumidifier draws air from and supplies air to the living space using its own ducts, not ducts that are connected to the HVAC system
Image
An innovative U-shaped heat pump offers SEER 15 efficiency and operation with smart phones
Image
Image
Anode bars can protect boiler steel without the bad effects of chemical water treatment
Image
Image
At the outlet of the dryer exhaust duct, install a hooded vent with a louvered damper
Image
Image
Back-draft damper still has a piece of tape that prevented it from rattling during shipping
Image
Baffles are installed to protect airflow from the soffits to the ridge vents before the ceiling drywall and attic insulation are installed.
Image
Balanced ventilation dominates ventilation specifications by Zero Energy Ready Home builders
Image
Image
Image
Because flue temperatures are cool, intake and exhaust ducts on a Category 4 direct-vent sealed-combustion condensing furnace can be made of PVC
Image
Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa
Image
Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa
Image
Image
Image
Image
Image
Image
Image
Image
Image
Building cavities not used as supply or return ducts unless they meet Items 3.2, 3.3, 4.1, and 4.2 of this Checklist
Image
Image
By plotting the heating capacities at -4°F and 5°F and drawing a line between them, the capacity at 0°F can be estimated
Image
Cavity used for return is not insulated and is not air sealed, which will pull in air from outside
Image
Image
Central-fan-integrated supply ventilation with exhaust fans for intermittently balanced whole-house ventilation
Image
Image
Clothes dryers vented directly to outdoors, except for ventless dryers equipped with a condensate drain
Image
Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off
Image
Image
Concept behind an evaporative cooler – warm air is cooled as the air passes through a wet medium and gives up some of its heat to evaporate the water
Image
Condensate from this heat pump water heater is routed to a nearby floor drain, shared with the condensate lines from a condensing gas furnace and an air conditioning coil
Image
Connect the plastic application tunnel from the injection equipment to the supply plenum.