Assessments - 5, GPA: 4.2
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Avoid the use of undersized ducting and sharp radius bends and tees which can significantly increase the system pressure drop and reduce the air flows. NOTE: Fully insulated ducting with an integral vapour barrier must be used on all runs passing through unheated areas in order to avoid condensation problems and energy losses from the air streams. The four ports on the Model 700 AND 900 are designed to accept 8" X 14" (200 X 356 mm) and the Model 1200, 8" X 20“ (200 X 508 mm) hard duct for attachment to the ductwork system. To minimize pressure drop and noise, galvanized metal ducts sized for 1200 fpm (6.09 m/s), (maximum velocity) are recommended. Keep ducting as short as possible and use a minimum of elbows and tees. Connecting sections and shorter runs may be flexible ducting one size larger than the metal duct. Use flexible duct connectors at the HRV to avoid noise transmission. All duct joints must be secured with screws, rivets or duct sealant and sealed with aluminum duct tape to prevent leakage. OUTSIDE WEATHERHOODS The weatherhoods must have built-in "bird" screens with 1/4 in. (.635 cm) minimum mesh to prevent foreign objects from entering into the ductwork. Do not use smaller mesh as it will be very susceptible to plugging up. Flappers and dampers at the vents must not be used as they will restrict air flow and often "seize up". The preferred location of the outside weatherhoods is: The outside perimeter of the weatherhood must be caulked to prevent leakage into the building. The design and size of the weatherhoods or louvers chosen by the installer must allow for adequate free area. Water and snow penetration of the system is minimized when the airflow does not exceed 750 FPM (3.81 m/s) free area velocity. B DUCTING from the WEATHERHOODS Galvanized sheet metal ducting with sufficient cross section with an integral single piece vapour barrier should be used to connect the HRV to the weatherhoods. All ducting must meet ULC Class 1 Fire Rating. A minimum R value of insulation should be equal to 4 (RSI 0.75). A good bead of high quality caulking (preferably acoustical sealant) and taping with a high quality aluminum foil tape is recommended to seal the duct to both the HRV and the weatherhood. WARMSIDE DUCTING - General Ducting from the HRV to different areas within the building should be galvanized metal whenever possible. To minimize airflow losses in the ductwork system, all ducts should be as short as possible and with as few bends or elbows as possible. 45° elbows are preferred to 90° elbows, whenever possible. Use Y tees instead of 90° tees whenever possible. All duct joints must be fastened with screws, rivets or duct sealant and wrapped with a quality duct tape to prevent leakage. We recommend aluminum foil tape. • no less than 10 ft. (3 m) apart from each other • at least 18 in. (46 cm) above ground level • away from sources of contaminants, such as automobile exhaust fumes, gas meters, garbage containers, etc. • not exposed to prevailing winds, whenever reasonably possible 4 STALE AIR RETURN SYSTEM The stale air return system is used todrawairfrom the points in the building where the worst air quality problems occur. Balancing dampers and/or adjustable grilles are recommended on all return air lines which are used during installation to help balance the "draw" from different areas of the building. Note that the installation schematics show balancing dampers and/or adjustable grilles on all return air lines coming back to the unit. These are installed to help balance the "draw" from the different areas of the building. Alternately, the stale air may be drawn directly from the return air duct. When this system is used the air handler's blower will constantly operate. The exhaust takeoff connection must be at least a meter from a directly connected HRV supply duct if both are connected to the same duct run. A damper located just prior to the HRV is required to balance the stale air exhausted with the fresh air supply entering the building. Return air suction points should be located at the opposite side of the room to the fresh air inlet. The inlets may be located in the ceiling or high on the walls and fitted with inlet grilles. In residential applications the gyproc and studs of the wall can be used as a "duct" for high wall returns. When using wall cavities this way, they should be lined with either galvanized sheet metal or polyethylene (check Local Codes). The wall plate and the floor ply must be cut out to accept either ducting or the proper sized sheet metal boot. Many commercial activities produce air contaminants in the form of dusts, fumes, mists, vapours and gases. Contaminants should be controlled at...
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