H Heating, Ventilation, and Air Conditioning
H4.
H3.1. Duct Mastic on Duct Joints and Seams( 1 Point) This measure applies to heating, cooling, and mechanical ventilation systems.
Although many kinds of tape are code compliant( commonly called“ UL 181 Approved”), these tapes are not suitable for this measure; only duct mastic provides the tightest and longest lasting seal. Duct mastic on top of code compliant tape is not acceptable. Fiber mesh tape that is thoroughly embedded in duct mastic is acceptable.
H3.2. Pressure Balance the Ductwork System( 1 Point)
For heating and / or cooling systems with ducted, forced air systems, pressure relieve the home with additional returns, baffles, transfer grilles, or jump ducts in rooms with doors.
Install an additional return duct in the master bedroom and / or other large rooms that can be closed off with a door. Install a jump duct or transfer grille between these rooms and the hall or main living area.
VERIFICATION Measure H3.1
Field Verification: The Rater will conduct field compliance verification and take representative photos of mastic on the joints, the boots, and at the air handler unit.
Measure H3.2
Field Verification: The Rater will conduct field compliance verification and take representative photos of transfer ducts or grilles, z-ducts, or the additional return.
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.
ENERGY STAR ® BATHROOM FANS MEET HVI STANDARDS WITH AIR FLOW VERIFIED
CRITERIA FOR QUALIFICATION
DRAFT
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.
DRAFT GreenPoint Rated New Home Rating Manual Version 6.0, September 2013 51 © Build It Green