NEC HT410 Installation Manual page 6

Optional Ceiling Mount Dimensions (Model #: HT40CM)
The following drawings show ceiling mount dimensions.
Dimensions are in inches. For millimeters multiply by 25.4.
The mount accommodates a 1.5" NPT treaded pipe extension or two 3/8"-16 threaded rod extensions.
Mount adjustments include roll, pitch and yaw.
Contact Peerless Industries for mount accessories at (800) 865-2112.
1.5" NPT
6.16
Standoffs
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