Energy Efficiency Ratings: Details

ENERGY STAR High Efficiency Haute Efficacité

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Products are eligible for ENERGY STAR® based on their U-factor (the lower the number, the more energy efficient the product) or their Energy Rating (ER - the higher the number, the more energy efficient the product).

To find models that are the most efficient, select the ENERGY STAR Most Efficient checkbox in the “Energy Efficiency Criteria” section below.

Download ALL the ENERGY STAR Most Efficient models. (ZIP Format)

ENERGY STAR technical specifications

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Brand Fenplast
Product Name ISOPLUS 4½ & 5¾
Style Casement (single)
U-factor (W/m² - K) 1.65
Solar Heat Gain (SHGC) 0.49
Energy Rating 32
ENERGY STAR Zone(s) 1|2
ENERGY STAR Most Efficient 2018 N
Frame Material Vinyl
Layers of Glazing 2
NRCan Reference NR5738-1603209-ES
Energy Efficiency Verification Reference FIN-M-21-00073-00001
U-factor (Btu/h/ft² - °F) 0.29
Visible Transmittance 0.491
Air Leakage - Infiltration (l/s*m²) 0
Air Leakage - Exfiltration (l/s*m²) 0
Registration Date 2008-11-04
Last Submitted 2018-02-01
Delisting Date 2018-09-13