DRAFT GreenPoint Rated Existing Home Rating Manual version 6.0 | Page 74

H

Heating, Ventilation, and Air Conditioning INTENT To improve system performance and energy efficiency. To improve the distribution of air and the comfort of the conditioned space by optimizing performance of the ducted system.

H6.

HIGH EFFICIENCY HVAC FILTER (MERV 8+)

CRITERIA FOR QUALIFICATION One point of credit is available for using HVAC air filters rated at MERV 8. VERIFICATION Field Verification: The Rater will conduct field compliance verification. Documentation: The Rater will obtain builder’s documentation of the MERV rating. INTENT To improve indoor air quality by regularly filtering indoor air via permanently installed equipment.

H7.

ENERGY STAR® BATHROOM FANS MEET HVI STANDARDS WITH AIR FLOW VERIFIED

CRITERIA FOR QUALIFICATION One point of credit is available for installing an ENERGY STAR® qualified bathroom exhaust fan on humidistat that is ducted to outdoors and controlled by a de-humidistat to operate whenever relative humidity exceeds 60%. A bathroom is defined as any room containing a tub and/or shower. Each bathroom exhaust fan must be sized according to the following HVI guidelines: ? ? ? Regardless of the size of the bathroom, each fan must exhaust a minimum of 50 cfm if operated intermittently or 25 cfm if operated continuously. Under 50 square feet: According to HVI guidelines, bathrooms less than 50 square feet should have a 50 cfm fan. 50-100 square feet: According to HVI guidelines, bathrooms between 50 and 100 square feet require one cfm per square foot of space, with a minimum of 50 cfm for intermittent operation or 25 cfm for continuous operation. For example, a 7' × 9' bathroom has 63 square feet of space, and therefore the fan must exhaust at least 63 cfm. Over 100 square feet: Ventilation for bathrooms over 100 square feet is based on the fixtures in the bathroom. Calculations for the minimum exhaust rate must allow for 50 cfm for each standard toilet, shower, or tub (standard or jetted). For example, an 11' × 14' bath (154 square feet) with one toilet, one shower, and one tub must have a fan that exhausts at least 150 cfm.

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VERIFICATION Field Verification: The Rater will conduct field compliance verification and take photos of venting and control strategy, and ENERGY STAR rating on the fan housing of the installed fan (if visible). GreenPoint Rated Existing Home Rating Manual Version 6.0, September 2013 © Build It Green

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