Fiberglass or rock wool batts and blown 1”

2.8–4.0

Blown cellulose 1”

3.0–4.0

Vermiculite loose fill 1”

2.7

Perlite 1”

2.4

White expanded polystyrene foam (beadboard) 1”

3.9–4.3

Polyurethane/polyisocyanurate foam 1”

6.2–7.0

Extruded polystyrene 1”

5.0

High-density 2-part polyurethane foam 1”

5.8–6.6

Low-density 2-part polyurethane foam 1”

3.6

Oriented strand board (OSB) or plywood ¹/₂”

1.6

Concrete or stucco 1”

0.1

Wood 1”

1.0

Carpet/pad ¹/₂”

2.0

Wood siding ³/₈–³/₄”

0.6–1.0

Concrete block 8”

1.1

Asphalt shingles

0.44

Fired clay bricks 1”

0.1–0.4

Gypsum or plasterboard ¹/₂”

0.4

Single pane glass ¹/₈”

0.9

Low-e insulated glass (Varies according to Solar Heat Gain Coefficient (SHGC) rating.)

3.3–4.2

Rated Fan   CFM

50

80

100

125

150

200

250

300

Duct Dia.

Smooth Hard Duct - Maximum Duct Length in Feet

3”

5

X

X

X

X

X

X

X

4”

114

31

10

X

X

X

X

X

5”

NL

152

91

51

28

X

X

X

6”

NL

NL

NL

168

112

53

25

9

7”

NL

NL

NL

NL

NL

148

88

54

8”

NL

NL

NL

NL

NL

NL

198

133

Duct Dia.

HVAC Flex Duct - Maximum Duct Length in Feet

3”

X

X

X

X

X

X

X

X

4”

56

4

X

X

X

X

X

X

5”

NL

81

42

16

2

X

X

X

6”

NL

NL

158

91

55

18

1

X

7”

NL

NL

NL

NL

161

78

40

19

8”

NL

NL

NL

NL

NL

189

111

69

NL: No limit;

X: not allowed

Table assumes no elbows. Deduct 15 ft from allowable duct length for each elbow.

ASTM E-136

If a material passes this test, it is non-combustible.

ASTM E-119

Hourly rating of a wall when exposed to fire. Deter­mines how long that the wall holds back heat and flames and maintains its structural integrity.

ASTM E-184

Hourly rating for a sealant system for a penetration through a fire-rated (ASTM E119) assembly.

ASTM E-84

Test measures how fast flames spread in a fire tun­nel lined with the tested material, compared to red oak, which is given a flame spread of 100. This test classifies materials as Class I, II, or III (or A, B, & C) See flame spread in the three rows below.

Class I or A

Flame spread less than or equal to 25

Class II or B

Flame spread 26 to 75

Class III or C

Flame spread 76 to 200

FM 4880 or UL-1040

Like ASTM E-84 except the fire burns in a 90-degree corner of a wall assembly containing the tested material. These tests are designed to closer approximate actual performance of a material installed in a typical building assembly. The flame spread and smoke developed ratings also relative to Class I, II, and III assemblies.

UL 1715

Like the tunnel test and corner test except the fire burns in a room with its wall and ceiling assembly containing the tested material. The flame spread and smoke developed ratings also relative to Class I, II, and III assemblies.

UL181

Duct materials, duct-closure systems, and duct sealants so labeled pass UL fire-resistance tests.