Reduced clearances using shielding | Drolet 1800 EPA specification

1.3.1 Reduced clearances using shielding

You may decrease the minimum clearances to combustible materials by installing heat radiation shields between the walls or the ceiling and the stove. Those heat radiation shields must be installed permanently, and must be made of a heat-resistant or heat-tolerant material. Consult the table below:

TYPE OF PROTECTION

Sheet metal, a minimum of 0,013" (0,33 mm) spaced out at least 7/8" (21 mm) by non-combustible spacers.

Ceramic tiles, or an equivalent non-combustible material on fire-proof supports spaced out at least 7/8" (21 mm) by non- combustible spacers.

Ceramic tiles, or an equivalent non-combustible material on fire-proof supports with a minimum of 0,013" (0,33 mm) sheet metal backing spaced out at least 7/8" (21 mm) by non- combustible spacers.

Reducing Clearances With

Shielding

	Sides and	Top
	Rear/Back	Top
	Rear/Back
	67%	50%
	50%	33%
	67%	50%

Brick spaced out at least 7/8" (21 mm) by non-combustible spacers.

Brick with a minimum of 0,013" (0,33 mm) sheet metal backing spaced out at least 7/8" (21 mm) by non- combustible spacers.

50%N/A

67%N/A

Source: CSA Standard B365-1991, Table 4, Page 27

Convert specification to R-value:

k-factor is given with a required thickness (T) in inches: R=1/k x T

C-factor is given: R=1/C

Example:

If the floor protector is 4” brick with a C-factor of 1.25 over 1/8” mineral board with a k factor of 0.29 the total R-value of the system is:

4” brick C=1.25, R=1/1.25=0.8

1/8” mineral board K=0.29, R=1/0.29 x 0.125=0.431 Total R = Rbrick + Rmineral = 0.8 + 0.431 = 1.231 Total R is greater than 1.0, the system is acceptable.