Hearth Requirements, Suitable Fireplace Dimensions

2.1.1 Hearth Requirements

If the non-combustible hearth is flush with the floor, then the hearth must be 16”/406mm (18”/450mm in Canada) in front of the fan housing (see Figure 2.1.2). If the non- combustible hearth is a minimum of 4” (102mm) above the floor, then the hearth can be 6” (152mm) out from the fan housing with a 10” (254mm) floor protection (sparks) extended beyond the hearth (see Figure 2.1.1). The non-combustible hearth must be a minimum of 8” (203mm) on each side of the unit (Canada & USA).

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.

Figure 2.1.1

Figure 2.1.2

2.2 Suitable Fireplace Dimensions

Escape 1400-I

Measurement for :

Opening Height (F)

Opening Width (G)

Opening Depth (H)

Minimum

21½” (546 mm)

29” (737 mm)

14” (356 mm)

Table 2.2