VELUX Non-Venting Curb-Mounted Skylight Specifications
 

Model FCM
 ventilating skylight
2222		 ventilating skylight
2234		 ventilating skylight
2246		 ventilating skylight
3030

W x H W x H W x H W x H
Inside Curb (in) 22-1/2 x
22-1/2		 22-1/2 x
34-1/2		 22-1/2 x
46-1/2		 30-1/2 x
30-1/2
Outside Curb (in) 25-1/2 x
25-1/2		 25-1/2 x
37-1/2		 25-1/2 x
49-1/2		 33-1/2 x
33-1/2
Maximum skylight clearance (in) 26-1/4 x
26-1/4		 26-1/4 x
38-1/4		 26-1/4 x
50-1/4		 34-1/4 x
34-1/4
Daylight Area-glass (in) 22-1/2 x
22-1/2		 22-1/2 x
34-1/2		 22-1/2 x
46-1/2

30-1/2 x
30-1/2
Daylight Area (sq ft) 3.52 5.39 7.27 6.46
Net Weight (lbs) 26 37 46 42

 

Model FCM
 ventilating skylight
3046		 ventilating skylight
3434		 ventilating skylight
4646

W x L W x L W x L
Inside Curb (in) 30-1-2 x
46-1/2		 34-1/2 x
34-1/2		 46-1/2 x
46-1/2
Outside Curb (in) 33-1/2 x
49-1/2

37-1/2 x
37-1/2

 49-1/2 x
49-1/2
Maximum skylight clearance (in) 34-1/4 x
50-1/4		 38-1/4 x
38-1/4		 50-1/4 x
50-1/4
Daylight Area-glass (in) 30-1/2 x
46-1/2

34-1/2 x
34-1/2

 46-1/2 x
46-1/2
Daylight Area (sq ft) 9.85 8.27 15.02
Net Weight (lbs) 46 42 85

Model FCM Test Results
 
AIR INFILTRATION
1.57 psf
75 Pa
0.20 cfm/ft2 1.02
l/s/m2
WATER RESISTANCE
2.86 psf
@ 5 US gal/ft2/h
 140 Pa
@ 3.4 l/m2/min
No Entry No Entry
STRUCTURAL PERFORMANCE

DOWNWARD LOAD WIND UPLIFT
Laminated,
Heat-Strengthened 		40-121 (psf) 45-110 (psf)
Laminated,
Tempered
40-121 (psf)
45-110 (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 (2.74)
0.33
0.56		 0.47 (2.68)
0.34
0.55
FADING PROTECTION %
GLAZING CLASSICAL UV
PROTECTION %		 TOTAL FADING
PROTECTION %
Tempered(75)
Laminated(74) 		87%
99.9% 		75%
83%

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