reduction clearance chart

[elkimmeg]

Table 12.6.2.1 Reduction of Appliance Clearance with Specified Forms of Protection
Clearance Reduction Applied to and Covering All Combustible Surfaces within the Distance Specified as Required Clearance with No Protection (See 12.6.1 through 12.6.1.3)
Maximum Allowable Reduction in Clearance (%)
Minimum Clearance
As Wall Protector
As Ceiling Protector
As Wall Protector
As Ceiling Protector
in.
mm
in.
mm
(a)
3½ in. (90 mm) thick masonry wall without ventilated air space
33
—
24
610
—
—
(b)
½ in. (13 mm) thick noncombustible insulation board over 1-in. (25.4-mm) glass fiber or mineral wool batts without ventilated air space
50
33
18
457
24
610
(c)
0.024-in. (0.61-mm), 24-gauge sheet metal over 1-in. (25.4-mm) glass fiber or mineral wool batts reinforced with wire, or equivalent, on rear face with ventilated air space
66
50
12
305
18
457
(d)
3½ in. (90 mm) thick masonry wall with ventilated air space
66
—
12
305
—
—
(e)
0.024-in. (0.61-mm), 24-gauge sheet metal with ventilated air space
66
50
12
305
18
457
(f)
½ in. (13 mm) thick noncombustible insulation board with ventilated air space
66
50
12
305
18
457
(g)
0.024-in. (0.61-mm), 24-gauge sheet metal with ventilated air space over 0.024-in. (0.61-mm), 24-gauge sheet metal with ventilated air space
66
50
12
305
18
457
(h)
1-in. (25.4-mm) glass fiber or mineral wool batts sandwiched between two sheets 0.024-in. (0.61-mm), 24-gauge sheet metal with ventilated air space
66
50
12
305
18
457
Notes:
1. All clearances and thicknesses are minimums; larger clearances and thicknesses may be permitted.
2. To calculate the minimum allowable clearance, the following formula can be used: C pr = Cun (1 - R/100). C pr is the minimum allowable clearance, Cun is the required clearance with no protection, and R is the maximum allowable reduction in clearance.
3. Refer to Figures 12.6.2.1(e) and 12.6.2.1(f) for other reduced clearances using materials found in (a) through (h) of this table.


the format did not make it here computer gurus any ideas to post Acrobat format here do I have to convert to pdf

 

[stoveguy2esw]

dang elk, i got a headache from that , lol, good info though

 

[begreen]

This is good info, but tables don't work well in forum context. The software keeps deleting spaces, etc.

This should be in a wiki. Send the info to me Elk if you don't have time. I'll post if for you.

 

[elkimmeg]

ther are very use full picture explaining everything for about 2 more pages I can cut and past to you As I remember I still have you e-mail address I will e-mail it to you
the wiki is format compatiable? if it is maybe I can send it there or cut and past there a little instructions might help I think my history of cat stoves would be interensing and
the simple things to do about draft stopping and insulation that recent post brought out

 

[begreen]

Sounds good. Send me what you have for the reduction of clearances chart and I'll try to translate it to wiki format.