DSDS — DUCT SMOKE DELIVERY SYSTEM · UL LISTED · NFPA 72 (2022) 14.4.3.2(e)
One technician.
Ground level.
Fully compliant.
The DSDS is a permanently installed testing port that ends scissor lifts, two-person crews, HEPA rentals, and skipped tests — for good.
SSU-DSDS · SSU-DSDP · UL LISTED
Testing is broken.
So it gets skipped.
Testing a duct smoke detector today means two-person crews, scissor lifts, HEPA cart rentals, and ceiling-tile removal in occupied spaces. Under that cost and disruption, many technicians fall back on the magnet test — an electrical check that never verifies the detector can actually detect smoke — leaving systems unverified and facilities exposed to liability.
STEP 1
Connect at the port
The technician attaches canned smoke to the permanently installed DSDS port — from the ground, in seconds. No lifts, no ceiling access.
STEP 2
Deliver smoke precisely
Test smoke travels through plenum-rated tubing directly into the duct airstream, upwind of the detector sampling tubes. No particulates enter the space.
STEP 3
Verify and document
A cable camera through the same port confirms damper status and mechanical function. Every test is NFPA 72-compliant and audit-ready.
PROVEN AT SCALE — RIVERSIDE METHODIST HOSPITAL, COLUMBUS OH
100+
DSDS devices installed campus-wide
Thousands
in staff and equipment costs eliminated
1 tech
per test, at ground level
1,000+
fire dampers under test campus-wide
"Testing now simply involves removing the fire damper cap, inserting cable cameras, and verifying function — requiring only one technician. It significantly reduced the man-hours previously required."
Joseph Brown · Former Lead Maintenance & Testing Technician, Riverside Methodist Hospital
Read the full case study →
Wherever detectors are tested at scale.
Hospitals & healthcare systems
Industrial data centers
Commercial office campuses
Pharmaceutical & cleanroom facilities
Schools, universities & government
Warehouses & commercial kitchens
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Compliance
UL Listed — Smoke Detector Accessory
NFPA 72 (2022) 14.4.3.2(e)
P/N SSU-DSDS · SSU-DSDP
NFPA 72 (2022) 14.4.3.2(e)
P/N SSU-DSDS · SSU-DSDP