External entrance doors.

All doors can be sorted to two main subgroups — internal doors and external. Everything is determined from the place where they will be mounted. The external are part of the facade of the building and, therefore, are forced to comply with it. But these are, of course, incomplete requirements that are usually presented to such doors. They must be safe and strong enough, and at the same time have impeccable heat — and soundproofing qualities.

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