Vent fan exterior trim ring
thingiverse
I purchased this fan for a cargo trailer conversion I'm doing to ventilate the bathroom. When it arrived I found out they do not include an exterior trim ring with it. https://www.amazon.com/gp/product/B07PH77ZHX/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 The holes are countersunk for a #8 screw.
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