Duct Fillers | McMaster-Carr

Clear All

	Insulation Type Insulation Type

	Sheet/Strip

	Thickness Thickness

5/16"

1 1/2"

2 3/16"

	Width Width

24"

36"

48"

	Length Length

	Flexibility Flexibility

Flexible

Rigid

	Material Material

Fiberglass

Plastic

	Maximum Temperature Maximum Temperature

Less than 250° F

250° to 499° F

Not Rated

	Facing Material Facing Material

	For Use On For Use On	Show

Duct

	For Use On For Use On	Hide

Warning: Products have one, but not necessarily all, of the selected characteristics.

Electrical Components

Electrical Contacts

Enclosures and
Equipment

Polycarbonate Plastic

Polyethylene

Polyethylene Plastic

Polyimide Plastic

Polypropylene Plastic

Viton® Fluoroelastomer
Rubber

Walls and Ceilings

Wood

	R Value R Value

	Backing Type Backing Type

	Plain

	Density Density

	Minimum Temperature Minimum Temperature

-60° F

0° F

Not Rated

	Color Color

	Brown
	Silver
	Yellow

	Facing Color Facing Color

	Silver
	White

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Heat Flow Rate Heat Flow Rate

	Specifications Met Specifications Met

ASTM E84 20/30 for Flame
and Smoke

ASTM E84 25/50 for Flame
and Smoke

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Minimum Facing Temperature Minimum Facing Temperature

0° F

	Backing Color Backing Color

	Silver

	Backing Material Backing Material

Aluminum Polyester

View catalog pages (2)

Forward

How can we improve?

45 Products

About Selecting Thermal Insulation

With Foil Facing

With Kraft Paper Facing

Temperature Range: 0° to 450° F
Facing Temperature Range: 0° to 150° F
Heat Flow Rate: 0.23 Btu @ 75° F
Density: See table
Color: Yellow
Facing Color:
Foil Facing: Silver;
Kraft Paper Facing: White
Specifications Met: ASTM E84 25/50 for Flame and Smoke

Insulate rectangular ductwork.

Sheets with foil facing reflect heat. The foil facing is also known as foil scrim kraft (FSK). Seal with reinforced HVAC tape (sold separately).

To seal sheets with kraft paper facing, use reinforced insulation tape (sold separately).

					Sheets with Foil Facing		Sheets with Kraft Paper Facing
Thick.	Wd.	Lg., ft.	R Value	Flexibility		Each		Each
3 lbs./cu. ft. Density
1"	24"	4	4.3	Rigid	000000	000000	000000	000000
1 1/2"	24"	4	6.5	Rigid	000000	00000	000000	00000
2"	24"	4	8.7	Rigid	000000	00000	000000	00000
6 lbs./cu. ft. Density
1"	24"	4	4.3	Rigid	000000	00000	000000	00000
1 1/2"	24"	4	6.5	Rigid	000000	00000	000000	00000
2"	24"	4	8.7	Rigid	000000	00000	000000	00000

Reinforced Insulation Tape for Sheets with Kraft Paper Facing	00000000	Each	000000
Reinforced HVAC Tape for Sheets with Foil Facing	00000000	Each	0000

Heat-Reflecting Air Bubble Duct Insulation Sheets

Temperature Range: -60° to 180° F
Heat Flow Rate: Not Rated
Density: Not Rated
Color: Silver
Specifications Met: ASTM E84 20/30 for Flame and Smoke

Typically used as duct wrap, these flexible sheets consist of polyethylene bubbles covered with aluminum polyester foil that prevent 96% of heat from radiating into or away from duct. Use on rectangular and round ductwork.

For technical drawings and 3-D models, click on a part number.

Air Bubble Insulation Sheets

			25 ft. Lg.		50 ft. Lg.		75 ft. Lg.		100 ft. Lg.
Wd.	R Value	Flexibility		Each		Each		Each		Each
5/16" Thick.
24"	4.2	Flexible	0000000	000000	0000000	000000	0000000	000000	0000000	0000000
36"	4.2	Flexible	0000000	00000	0000000	000000	0000000	000000	0000000	000000
48"	4.2	Flexible	0000000	00000	0000000	000000	0000000	000000	0000000	000000

Spacers

Spacers installed between the duct and air bubble insulation sheet increase the R-value to 6. One spacer roll covers approximately 10 ft. of 8" duct.

Thick.	Wd.	Lg., ft.		Each
5/16"	2"	25	0000000	00000

Flexible Fiberglass Duct Insulation Sheets

Wrap rectangular and round ductwork with this flexible insulation. Seal with reinforced HVAC tape (not included).

Sheets with foil facing reflect heat. The foil facing is also known as foil scrim kraft (FSK).

Sheets with vinyl facing are tear resistant.

Sheets with Foil Facing

With Foil Facing

Temperature Range: 0° to 250° F
Heat Flow Rate: 0.26 Btu @ 75° F
Color: Brown
Facing Color: Silver
Specifications Met: ASTM E84 25/50 for Flame and Smoke

			10 ft. × 48"		50 ft. × 48"		75 ft. × 48"		100 ft. × 48"
Thick.	R Value	Flexibility		Each		Each		Each		Each
1 1/2"	4.5	Flexible	0000000	000000	000000	00	000000	00	0000000	0000000
1 1/2"	4.8	Flexible	0000000	00000	000000	00	0000000	0000000	000000	00
1 1/2"	5	Flexible	000000	00000	000000	00	000000	00	000000	000000
2"	5.6	Flexible	0000000	00000	000000	00	0000000	000000	000000	00
2"	6	Flexible	0000000	00000	000000	00	0000000	000000	000000	00
2"	6.4	Flexible	0000000	000000	0000000	0000000	000000	00	000000	00
2 3/16"	6	Flexible	0000000	00000	000000	00	0000000	000000	000000	00
3"	8.4	Flexible	0000000	00000	0000000	000000	000000	00	000000	00

Reinforced HVAC Tape

00000000

Each

00000

Sheets with Vinyl Facing

With Vinyl Facing

Temperature Range: Not Rated
Heat Flow Rate: 0.26 Btu @ 75° F
Density: 0.95 lbs./cu. ft.
Color: Yellow
Facing Color: White

			10 ft. × 48"		100 ft. × 48"
Thick.	R Value	Flexibility		Each		Each
2"	7.7	Flexible	0000000	000000	0000000	0000000

Reinforced HVAC Tape

00000000

Each

00000

Email Us

About Selecting Thermal Insulation

Rigid Fiberglass Duct Insulation Sheets

Heat-Reflecting Air Bubble Duct Insulation Sheets

Flexible Fiberglass Duct Insulation Sheets