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Fan housing was oriented in the correct direction to allow proper exhaust duct installation
Fans from seperate dwellings exhausted together without back-draft dampers and not sealed
Fiberglass mesh tape is installed around a duct boot in preparation for air sealing with mastic
Finished raised ceiling duct chase
Flexible ducts in unconditioned space not installed in cavities smaller than outer duct diameter; in conditioned space not installed in cavities smaller than inner duct diameter
Flexible ducts supported at intervals as recommended by mfr. but at a distance ≤ 5 ft
Fresh air intakes and exhaust vents are ducted to each unit in this multifamily building
Hand tools for cutting fiber board sheets include a knife, straight edge, and color-coded edge-cutting tools
HVAC ducts can be encapsulated in 3 inches of closed-cell spray foam, then buried in R-49 of blown fiberglass insulation after the ceiling drywall is installed in the vented attic.
HVAC ducts, cavities used as ducts, and combustion inlets and outlets may pass perpendicularly through exterior walls but shall not be run within exterior walls unless at least R-6 continuous insulation is provided on exterior side of the cavity
If a dropped soffit is used to house a duct, the soffit space must equal the duct diameter plus the insulation thickness
If airflow must be limited to a supply register, use balancing dampers at the trunk line rather than looping duct to control airflow
If HVAC duct must be installed in an exterior wall, separate it from the exterior with at least R-6 of continuous rigid insulation
Inadequate amount of insulation installed with compression, misalignment, and voids
Install bottom layer of rigid insulation
Install duct supports in line with ceiling trusses
Install supply registers in floors or ceilings to avoid routing ducts through exterior walls
Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
Jump ducts are installed in the ceiling to connect closed rooms with open space to provide a return air path and balance air pressure
Lay out duct so that no radius of a bend or turn is less than the diameter of the airway
Manual D details show duct size and chase path