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MATERIAL SELECTION CALCULATIONS
The following provides further detail on the relationship between various clearance dimensions and gives examples
of what specific dimensions may be if other clearances are adjusted.
Dim. Description
A
Overhang
B
Clearance above
C
Side overhang
D
Side clearance
Please note the recommended clearances in the tables above. Wall surface temperature may be
elevated directly above the appliance and may discolour paint finishes or distort vinyl coverings.
CAUTION
Rinnai
Material temperature rated above ambient
Materials rated to a max. of 50 °C
Not suitable if B is under 250 mm
No restrictions if B is greater than 1000 mm
If B is 300-1000 mm then the calculation is: A = B - 250
If B = 300 and A = 300-250, the overhang can be 50 mm max.
If B = 350 and A = 350-250, the overhang can be 100 mm max.
If B = 400 and A = 400-250, the overhang can be 150 mm max.
If B = 450 and A = 450-250, the overhang can be 200 mm max.
100 mm min.
If recessed with an overhang B =A+250
If A = 50 and B = 50+250, clearance above needs to be 300 mm min.
If A = 100 and B = 100+250, clearance above needs to be 350 mm min.
If A = 150 and B = 150+250, clearance above needs to be 400 mm min.
If A = 200 and B = 200+250, clearance above needs to be 450 mm min.
No restrictions if D is greater than 400 mm
If D is less than 400 mm, C = D+50
C = 50 +50, side overhang 100 mm max.
C = 100+50, side overhang 150 mm max.
C = 150+50, side overhang 200 mm max.
C = 200+50, side overhang 250 mm max.
50 mm min.
No restrictions if D is greater than 400 mm
If D is less than 400mm = C-50
150-50, side clearance must be 100 mm min.
200-50, side clearance must be 150 mm min.
250-50, side clearance must be 200 mm min.
300-50, side clearance must be 250 mm min.
350-50, side clearance must be 300 mm min.
400-50, side clearance must be 350 mm min.
A
B
Side view
Side view
E
non-combustible hearth
F
Un-rated material floor
In this case, F can be reduced using
F = 450 - E mm min.
GENERAL INSTALLATION INFORMATION
Unrated materials, up to a max. of 20 °C
200 mm min
If recessed with an overhang B =A+250
No restrictions if D is greater than 400 mm
If D is less than 400 mm, C = D
C = 50, side overhang 50 mm max.
C = 100, side overhang 100 mm max.
C = 150, side overhang 150 mm max.
C = 200, side overhang 200 mm max.
100 mm min.
No restrictions if D is greater than 400 mm
If D is less than 400mm = C
150, side clearance must be 150 mm min.
200, side clearance must be 200 mm min.
250, side clearance must be 250 mm min.
300, side clearance must be 300 mm min.
350, side clearance must be 350 mm min.
400, side clearance must be 400 mm
D
Top view
Front
C
A
B
9
A =100, so
B = 350 (A + 250)
C = 100, so
D = 50 (C-50)
SS850 Freestanding IM
min.
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