ReliaBilt® windows and doors may be ordered to meet [ENERGY STAR logo] ENERGY STAR® criteria.
U-FACTOR
Measures the heat from inside a room that can escape. The LOWER the number, the lower the potential for wasted heating expenses.
VISIBLE TRANSMITTANCE
Measures how much natural light can come into a room. A HIGH number means more natural light.
SOLAR HEAT GAIN COEFFICIENT
Measures the amount of outdoor heat that can enter a room. The LOWER the number, the lower the potential for wasted cooling expenses.
AIR LEAKAGE
Measures how much air will enter a room through the product. The LOWER the number, the lower the potential for a draft through the product.
Diagram: How Heat and Light Interact with a Home
The diagram illustrates a cross-section of a house with four rooms, depicting energy performance concepts. The top left room shows a fireplace with heat escaping upwards and outwards, illustrating heat loss. The top right room shows people using fans, with wavy lines indicating heat entering from outside, representing solar heat gain. The bottom left room shows sunlight entering through a window, illuminating a person reading, demonstrating visible transmittance. The bottom right room shows wavy lines indicating air entering through a window, symbolizing air leakage.
AN EXAMPLE OF THE NFRC LABEL YOU SHOULD LOOK FOR:
| Category | Value | Description |
|---|---|---|
| Product Name | "No Grid" TrplGlazed | |
| Brand | RELIABILT | |
| Series | 3900 | |
| Type | VINYL Double Hung Triple IG Low-e-Argon | |
| Manufacturer ID | MFR#073 | |
| Certification Number | ADW-A-356-00091-00009 | |
| ENERGY PERFORMANCE RATINGS | ||
| U-Factor (U.S./I-P) | 0.21 | |
| Solar Heat Gain Coefficient | 0.18 | |
| ADDITIONAL PERFORMANCE RATINGS | ||
| Visible Transmittance | 0.34 | |
| Air Leakage | - | |
U-FACTOR (Label Context)
Ratings generally fall between 0.20 and 1.20. The LOWER the better a product is at keeping heat in. U-Factor is particularly important during the winter season.
VISIBLE TRANSMITTANCE (VT) (Label Context)
(VT) is expressed as a number between 0 and 1. The HIGHER the VT, the higher the potential for daylighting.
SOLAR HEAT GAIN COEFFICIENT (SHGC) (Label Context)
(SHGC) is expressed as a number between 0 and 1. The LOWER the better a product is at blocking unwanted heat gain. Blocking solar heat gain is particularly important during the summer season.
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NFRC administers an independent, uniform rating and labeling system for the energy performance of fenestration products including windows and doors. For more information on NFRC, visit their website at www.WindowRatings.org.
Manufacturer stipulates that these ratings conform to applicable NFRC procedures for determining whole product performance. NFRC ratings are determined for a fixed set of environmental conditions and a specific product size. NFRC does not recommend any product and does not warrant the suitability of any product for any specific use. Consult manufacturer's literature for other product performance information. www.lrc.org
