Technical Guide

635425-YTG-D-0413
Johnson Controls Unitary Products 9
TYPICAL APPLICATIONS WITH MC MULTI-POSITION COILS
COMBUSTIBLE FLOOR BASE ACCESSORY
DOWNFLOW
AIR HANDLER
WARM AIR PLENUM
WITH 1” FLANGES
FIBERGLASS
INSULATION
FIBERGLASS TAPE
UNDER FLANGE
COMBUSTIBLE FLOOR
BASE ACCESSORY
A
B
B
A
AIR HANDLER
DEPTH
FRONT
FLOOR
1
10-47/64
PLENUM
12-1/2
FLOOR OPENING
APPROX. 1/2”
CLEARANCE
ALL AROUND
FLOOR
A
AIR HANDLER
WIDTH
COMBUSTIBLE
FLOOR BASE
11
APPROX. 1/2”
CLEARANCE
ALL AROUND
C
FLOOR OPENING
B
PLENUM
All dimensions are in inches. They are subject to change without notice.
Certified dimensions will be provided upon request.
DIMENSIONS
Floor Base Model Used with
Dimensions
ABCD
1FB1817 MX12B 19.9 18.0 14.9 16.9
1FB1821 MX16C 23.4 21.5 18.4 20.4
1FB1824 MX12D, MX20D 26.9 25.0 21.9 23.9
APPLICATION FACTORS - Rated CFM vs. Actual CFM
% OF RATED AIR FLOW 80% 90% RATED CFM 110% 120%
CAPACITY FACTOR 0.96 0.98 1.00 1.02 1.03
UPFLOW
DOWNFLOW
HORIZONTAL RIGHT
HORIZONTAL LEFT