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Fantech Heat Recovery Ventilator Model VHR 704R - 56 CFM Includes recirculating defrost system. Will ventilate homes up to 1,400 square feet. Indoor air quality problems have soared since the late 1970's when construction technology succeeded in developing energy efficient "tight" houses. Pollutants inside houses, which once escaped through cracks around windows and doors, are now trapped inside creating an indoor environment that is often 2 to 5 times more polluted than outside. Pet dander, mold spores, dust mites, allergens, tobacco smoke and other pollutants add up to poor indoor air quality. Fantech's line of IAQ Products can help you solve these problems through better ventilation. Choose from a complete line of Heat Recovery and Energy Recovery Ventilators to bring fresh outside air into the house while expelling stale polluted air. Fantech VHR Series Heat Recovery Ventilators are high performance, low maintenance units designed to improve indoor air quality and provide balanced ventilation in residential applications. Units include many installer-friendly features - easy-slide core guides, external electrical box, easy-access doors, and much more. Compact size and vertical ports add flexibility at installation. Ideal for applications where space is limited. The HRV brings in fresh outdoor air and draws it through an aluminum core where it is heated by the stale outgoing air. The HRV then distributes the preheated fresh filtered air throughout the home by direct ductwork installed specially for the HRV or through the ductwork of a forced-air system. Sizing For Your Residential Needs HRVs/ERVs are typically sized to ventilate the whole house at a minimum of .35 air changes per hour. To calculate minimum CFM requirements, simply take the square footage of the house (including basement) and multiply by the height of the ceiling to get cubic volume. Then, divide by 60 and multiply by .35. CLICK HERE FOR MORE INFORMATION ON SIZING AN AIR EXCHANGER FOR YOUR HOME SPECIFICATIONS CASE: 24 gauge galvanized steel. Powder coated finish, antique white. Insulated with 1" (25 mm) high density polystyrene foam to prevent condensation and meet the requirements of the Underwriters Laboratories 94HF. MOTORS: Two (2) German-engineered, factory-balanced ebmT motors with backward curved blades. Motors come with permanently lubricated sealed bearings guarantee long life and maintenance-free operation. Seven (7) year warranty. FILTERS: Two (2) Washable Electrostatic Panel Type Air Filters, 8.5" (216mm) x 8" (203mm) x 0.125" (3mm). CORE Core, filters, motors and drain pan can be easily accessed through latched door. Core conveniently slides out on our new easy glide core guides. 10" (250mm) of clearance is recommended for removal of core. CONTROLS: External three (3) position (Low/Stand By/Medium) rocker switch that will offer continuous ventilation. DEFROST: A preset defrost sequence is activated at an outdoor temperature of 23° F (-5°C) and lower. During the defrost sequence, the fresh air is interrupted momentarily and indoor air is allowed to recirculate in the exchanger to maximize the effectiveness of the defrost strategy. The unit then returns to normal operation until the next defrost sequence. INSTALLATION: Unit is typically wall mounted using included wall mounting bracket. SERVICEABILITY Core, filters, motors and drain pan can be easily accessed through latched door. Core conveniently slides out on our new easy glide core guides. 10" (250mm) of clearance is recommended for removal of core. POWER: 120 VAC, .4 Amps, 40 watts on high speed. UNIT DIMENSIONS: 21.4" W X 15.4" H X 10.2" D DUCT CONNECTION: 5" Oval Duct Collars