Ceiling extension collar allows Iolite new construction housings to install in ceiling thicknesses up to 2". Compatible Housings: NHIOICD-28, NHIOICDCP-28, NHIOICD-215, NHIOICDCP-215, NHIOICD-220, NHIOICDCP-220, NHIOICD-225, NHIOICDCP-225
Ceiling extension collar allows Iolite new construction housings to install in ceiling thicknesses up to 2". Compatible Housings: NHIOICD-28, NHIOICDCP-28, NHIOICD-215, NHIOICDCP-215, NHIOICD-220, NHIOICDCP-220, NHIOICD-225, NHIOICDCP-225
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