perhaps clumsily phrased by me. sure, it's a standard size but an unusual one. Not many keep it in stock. not even the door manufacturers have it in stock but manufacture it only after someone has ordered it. If you have a door that is 90x215, it's cheapest to build in the hole to 90x210. if you use a casing that is 22x120 or 22x145, then you don't need to do too much exterior work.
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