Product Overview

Effective: March 2020
3F-12-0-001
HORIZONTAL DETECT-A-FIRE DETECTOR SPECIFICATIONS
Horizontal D-A-F detectors are designed for locations where appearance is a factor. The low-profile, functional design
lends physical protection of the detector while making it suitable for commercial, industrial, mercantile public buildings,
institutions, and marine applications in non-hazardous locations (those classified as "ordinary" under the National Electric
Code). Flush mounted detectors are designed to fit standard 4-inch octagonal electric boxes and surface mounting detec-
tors are designed to mount directly on ceilings or on 4-inch electrical junction boxes. Canadian Electrical Codes requires
mounting only to an electrical junction box.
Horizontal Models
Table 3: Model Numbers: 27021-0, 27021-1, 27020-0*, 27020-1*
°F
Setting
°F
Tolerance
Spacing
(in feet)
RTI
Color
Coding
UL ULC FM
140 +7/-8 50 50 20 Quick Black
160 +7/-8 25 25 20 Quick Black
190 +7/-8 50 50 25 Fast White
210 +7/-8 25 50 25 Fast White
225 +7/-8 25 50 25 Fast White
275 ±10 25 50 25 Fast Blue
325 ±10 50 50 25 Fast Red
• *27020-0 and 27020-1 are normally closed devices and do not meet the
requirements of NFPA-72 for use as initiating devices
(they are 2-wire devices).
• *27020-0 and 27020-1 are not listed by FM with RTI.
Table 4: Horizontal D-A-F Specifications
Model Number Mounting Style Contact Operation
Electrical Rating
(Resistive Only)
27020-0 Flush Mount
Normally Closed
(Open on Rise)
5.0 Amps 125 VAC
0.5 Amps 125 VDC
27020-1 Surface Mount
27021-0 Flush Mount
Normally Open
(Close on Rise)
5.0 Amps 125 VAC
0.5 Amps 125 VDC
2.0 Amps 24 VDC
1.0 Amps 48 VDC
27021-1 Surface Mount
Approximate weight: 10 oz.
Figure 6. Horizontal Detectors
Note: Horizontal D-A-F detectors are
equipped with connector blocks in
place of leadwires.