VELUX Fixed Skylight with Ventilation Flap Specifications
 

Model FSF
 ventilating skylight
104		 ventilating skylight
106		 ventilating skylight
304		 ventilating skylight
308		 ventilating skylight
606

W x H W x H W x H W x H W x H
Outside Frame (in) 21-1/2 x
38-1/2		 21-1/2 x
46-3/8		 30-5/8 x
38-1/2		 30-5/8 x
55		 44-3/4 x
46-3/8
Finished Frame Dimension (in) 20-1/2 x
37-3/16		 20-1/2 x
45-1/16		 29-9/16 x
37-3/16		 29-9/16 x
53-3/4		 43-3/4 x
45-1/16
Rough Opening for EDL/EDW/EDM Flashing (in) 21-1/2 x
39		 21-1/2 x
46-7/8		 30-1/2 x
39		 30-1/2 x
55-1/2		 44-3/4 x
46-7/8
Daylight Area-glass (in) 18-3/16 x
32-9/16		 18-3/16 x
40-7/16		 27-1/4 x
32-9/16

27-1/4 x
49-1/8

 41-7/16 x
40-7/16
Daylight Area (sq ft) 4.11 5.11 6.16 9.30 11.64
Ventilation Area (opening) (sq in) 13.30 13.30 19.50 19.50 29.10
Net Weight (lbs) 44 52 58 77 94

 

Model FSF Test Results
 
AIR INFILTRATION
1.57 psf
75 Pa
0.14 cfm/ft2 0.71
l/s/m2
WATER RESISTANCE
9.75 psf
@ 5 US gal/ft2/h
 466.5 Pa
@ 3.4 l/m2/min
No Entry No Entry
STRUCTURAL PERFORMANCE

DOWNWARD LOAD WIND UPLIFT
Laminated,
Heat-Strengthened 		46-188 (psf) 18-68 (psf)
Laminated, Tempered 72-174 (psf) 23-63 (psf)

THERMAL PERFORMANCE
(Complete unit values)
All thermal performance SHGC Vt values for VELUX® skylights are NFRC certified, labeled and listed in the NFRC product directory. (In accordance with NFRC procedures.)
GLASS
New 20° slope ratings shown		 Tempered (75)
Tempered,
Low-E2,
Argon
Gas-filled 		Laminated (74)
Laminated,
Low-E2,
Argon
Gas-filled
U-factor (R-Factor)
SHGC
Vt 		0.48 (2.08)
0.33
0.55		 0.47 (2.13)
0.33
0.54
FADING PROTECTION %
GLAZING CLASSICAL UV
PROTECTION %		 TOTAL FADING
PROTECTION %
Tempered(75)
Laminated(74) 		87%
99.9% 		75%
83%

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