A foyer in a house is usually a small entry area or room by the front door. Other public rooms such as the living room, dining room, and family room typically attach to it, along with any main stairway. It was initially intended as an "airlock", separating the fireplace-heated rooms from the (colder, in winter) front entrance, where cold air infiltration made for cold drafts and low temperatures. It is commonly used for outer garment and umbrella storage for both residents and guests.
Buy foyer gates from action ornamental iron works
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in section "Entrance doors"