____ Are Narrow, Closely Spaced, Concave Grooves That Run Parallel

Q11: A _ is a twist in the

Q12: The _ door is opened by sliding

Q13: The outside vertical edge members of a

Q14: French doors may contain from 1 to

Q15: Before windows are installed, the exterior walls

Q17: Double-hung windows are twice as large as

Q18: Louver doors are made with spaced horizontal

Q19: A(n) _ window unit consists of a

Q20: The bottom horizontal member of the window

Q21: Bifold doors are made in wider widths