Bradford White UCG100H199 Installation & Operation Manual page 10

Figure 2a – Minimum Clearance
to Combustible Material
Input
Less than or equal to
270,000 BTUH
Figure 2b – Recommended Minimum
Clearances for Service Access
10
Sides, Rear "A"
Front "A"
4 in. (10.2 cm) 0 in. (0 cm)