f. Previewing films and filmstrips and listening to re-
 cordings
 g. Teaching projectionists the care and use of equipment
2. Space Allocation
 Minimum of 200 square feet a long and narrow room,
 if it is to be used for previewing and listening (In very
 small schools it may be necessary to store audio-visual
 equipment in the work-storage area, adding suitable
 amount of space according to material to be housed.)
3. Placement
 Adjacent to and opening into work area with outside en-
 trance to corridor or outside of building so that audio-
 visual equipment can easily be taken in and out of storage
 areas
4. Equipment
 a. Standing-height work counter, 36" 42" high, with top
 of plastic laminate or similar material and storage area
 for audio-visual equipment underneath and cabinets
 for supplies above (Storage cabinets for audio-visual
 equipment should accommodate motion-picture pro-
 jectors; filmstrip projectors; opaque and overhead pro-
 jectors; record players; tape recorders; projection
 screens. This cabinet space should be low, not over
 4" off floor, so that the heavy equipment does not have
 to be lifted far off the floor. Motion-picture projectors
 may be kept on roller tables for which space must be
 provided. (See Appendix, Drawing 10.) Amount of
 audio-visual materials and equipment to be housed
 should be determined in consultation with librarian or
 audio-visual coordinator at the school or county level.)
 b. Storage space for roller-type maps (Provide one set
 of hooks so that a map can be unrolled for examina-
 tion before it is checked out.)
 c. Storage cabinet for recordings (See Appendix, Draw-
 ing 6.)
 d. At least two conveniently placed double electrical out-
 lets or electrical wire molding
 e. Darkening facilities and acoustical treatment, if used
 for previewing and listening