Which window type gives the most ventilation?+
A casement, because the entire sash swings clear of the opening. An awning or projected unit of the same size ventilates less since the sash only tilts partway out, and a fixed unit provides none. Where an opening has to both ventilate and meet egress, a casement is usually the answer.
What is the difference between an awning, a projected, and a hopper window?+
All three tilt rather than swing sideways. An awning is hinged at the head and opens outward at the bottom. A hopper is hinged at the sill and tilts inward into the room. A projected unit is a commercial-grade version that rides on four-bar or friction arms instead of a crank, with specifiable projection distance and limit stops.
Which type is best for a bedroom that needs egress?+
Almost always a casement. Egress is judged on clear opening — the actual hole once the sash is fully open — and a casement gives close to its full sash area. Awning, hopper, sliding, and double-hung units surrender part of the opening, so they need a physically larger hole to reach the same clear opening.
Can different types be combined in one opening?+
Yes, and most punched openings are combinations. A large fixed lite with an awning or hopper vent below, or a pair of casements flanking a fixed center, are joined with structural mullions inside a single frame. The assembly is installed as one piece and the perimeter is sealed once, and performance is then reported for the whole assembly.
Are fixed windows cheaper than operable ones?+
Yes, meaningfully. A fixed unit has no hardware, no weatherstrip at an operating joint, and no screen, so it costs less per square foot of glass and delivers better air-infiltration and thermal numbers. That is why commercial elevations typically use mostly fixed lites with a small number of vent units for ventilation.
Which types do you supply for homes versus commercial buildings?+
The same five operation types cover both, but the frame system differs. Residential projects lean on casement, awning, fixed, and hopper units in a residential-grade thermally broken frame. Commercial projects use heavier frames with higher performance class and grade, and projected units appear almost exclusively there.
