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The National Fenestration Rating Council (NFRC) is the official US thermal rating organization for windows and doors. NFRC standards are developed and maintained through a consensus process with a committee and subcommittee structure. NFRC provides ratings for the following window characteristics:
U-factor – NFRC 100
SHGC (Solar Heat Gain Coefficient) – NFRC 200
VT (Visible Transmittance) – NFRC 200
Air Infiltration – NFRC 400
Condensation Resistance – NFRC 500
U-factor, SHGC, VT, and Condensation Resistance are all calculated by Enermodal Engineering using computer simulation.
NFRC also maintains a certification program for these ratings in which U-factor, SHGC, and VT are mandatory, and Air infiltration and Condensation Resistance are optional. Products are certified using the following steps:
| 1. |
Have products simulated - Enermodal Engineering
· Drawings and bills of material are required
· You approve the reports to be released to an IA (Inspection Agency) |
| 2. |
Have best product in each line tested - Enermodal Engineering
· A sample product must be sent to the lab
· Enermodal will provide the size and glazing requirements
· You approve the reports to be released to an IA |
| 3. |
The Inspection Agency reviews the reports and issues a Certification Authorization Report (CAR) for each product line based on the simulation results.
· Ask Enermodal for a list of IAs
· The IA should be contacted early in the process |
| 4. |
Label your certified products.
· Your IA must supply or approve your labels |
NFRC requires that products be re-certified every four years. Options may be added to a product line at any time by contacting Enermodal Engineering.
Enermodal has performed over 50,000 simulations on window and door products and is certified by the NFRC. Enermodal staff have spent years in window and door manufacturing and understand product design issues.
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