Drolet 1800i, Osburn Inspire 2000 insert, and Osburn 3500i
Which inserts have a ceiling clearance spec?
I've emailed SBI about this, but here's what I see in their documents.
The Drolet Escape 1800-I requires 84" of "Clearance - Base of the unit to ceiling" according to the website. Its Owner's Manual reiterates this requirement (clearance Q) in section 3.1 on page 13.
The Osburn Inspire 2000-I requires 84" of "Clearance – top (measured from the platform on which the appliance is installed)" according to the website. Its Installation and Operation Manual reiterates this requirement (clearance Q) in section 9.3 on page 39.
The Osburn 3500-I requires 84" of "Clearance – top (measured from the platform on which the appliance is installed)" according to the website. Its Installation and Operation Manual reiterates this requirement (clearance Q) in section 9.3 on page 36.
As I mentioned before, I've seen this requirement for almost every SBI insert I've looked at, with the exception of a few of the smallest models, which only require 72".
I'll be happy if SBI responds and explains it's a mistake. That would open up some options, since they own a number of brands. But if it's a mistake, then it's a mistake they've somehow included in all their manuals. Right now the available evidence suggests it's a legit (though bizarre) requirement.
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