The GDI Difference. GDI was founded by engineers who design for reality: harsh weather, high cycles, limited space, glass and specialty façades, and strict safety requirements. Instead of forcing your project to fit a catalog, we adapt our platforms to your constraints — and we do it collaboratively.
Design‑Ready Features (What Matters in CD Sets)
Concealed Mounting & Serviceability. Slim direct‑drive and trolley packages recess into jambs/soffits while preserving tool access. Service panels are concealed but reachable.
Sightlines & Glass Protection. Hardware stays clear of edges; torque and speed profiles prevent shock loading on large IGUs or ceramic fireplace glass.
Noise Control. Tuned ramps and isolation mounts help meet lobby and gallery targets (design toward NC‑25; verify in field conditions).
Life‑Safety & Controls. Native I/O for fire alarm (drop/disable), access control, e‑stops, and guard devices (edges, photo‑eyes, curtains, or vision).
Environment & Finish. NEMA 1 for interiors, NEMA 4 for wet/soot‑prone zones; custom powder to match architectural metals.
Coordination‑First Submittals
Shop drawings with mounting sections, pull‑box locations, and I/O schedules aligned to your E, A, and M sheets.
Mockups & Prototyping
Early fit‑ups for atypical glass guides, counterweights, or heat‑shield details prevent surprises at install.
Commissioning Playbook
On‑site tuning for ramps, soft‑landings, and obstruction responses; turnover logs for O&M.
Aesthetic Hardware
Low‑profile covers, blacked‑out fasteners, and finishes that disappear against frames or stone.
Case Study: Large Fireplace Glass Doors Smooth, safe motion & clean integration
Brief: two large ceramic‑glass doors move to reveal a linear fireplace in a hotel lobby. Constraints: heat and soot, minimal visible hardware, quiet movement, and a positive stop clear of the flame envelope.
- Approach: remote‑mounted direct‑drive with shielded linkage away from radiant heat; NEMA 4 enclosure near the service bay.
- Sightlines: recessed guides and back‑painted cover strips to hide fasteners.
- Safety: e‑stop at millwork, photo‑eyes across travel, fire alarm interlock to safe position.
- Commissioning: soft‑open/close ramps to protect seals and glass; obstruction reverse tuned to panel mass.
Controls & Integration (for EOR and Controls Engineers)
I/O: dry‑contacts for call/close/stop, interlocks for fire alarm and access, programmable obstruction response. BMS/PLC: optional BACnet/Modbus gateway or discrete I/O mapping. Show control: timed cues via relay or PLC scene.
Safety & Compliance
Project‑specific risk assessment covers guarded edges, entrapment zones, pinch points, and egress paths. We specify sensing (edges, photo‑eyes, curtains, or vision) and validate stop/reverse profiles during commissioning. Documentation includes test records for turnover.
Coordination Checklist (Drop into Your CDs)
- Loads: panel mass, target speed, duty cycle, wind/stack or thermal forces.
- Clearances: service pockets, jamb/soffit depth, guide reveal, pinch protection.
- Power: circuit, disconnect location, low‑voltage raceways.
- Controls: access control, fire alarm interlocks, BMS/PLC points list.
- Finishes: coating, cover plates, fastener color, glass edge protection.
- Commissioning: ramps, obstruction test plan, turnover docs.
Sample Sequence of Operation
1. Normal: Open/Close via momentary call; controller ramps to target speed; soft‑land at limits.
2. Obstruction: stop within programmed distance; reverse to safe position; require clear & reset.
3. Fire Alarm: drive to predefined safe state (typically closed); inhibit further commands until clear.
4. Access Control: honor secure inputs; log command source if gateway present.
5. Loss of Power: manual release available where required; fail position per risk assessment.
“The GDI team spoke our language — sightlines, tolerances, and commissioning. They delivered details we could drop straight into our CD set.” — Project Architect, Hospitality Lobby Renovation
FAQ for Designers & Engineers
Do you build openers for overhead/sectional doors as well as sliding and rolling steel?
Yes. Our platforms cover overhead/sectional, sliding, and rolling steel doors, plus glass storefront and specialty mechanisms. We size the motor/gear and control package to the door mass, travel, and duty cycle.
Can you retrofit our existing chain & sprocket system?
Often, yes. We can reuse quality mechanics and upgrade the operator for brushless control, smarter safety, and better diagnostics. Where hardware is past end‑of‑life, we’ll recommend replacements.
How do your openers integrate with access control and BMS?
We provide dry‑contact inputs and relay outputs that work with most access systems, with optional gateways for BACnet or Modbus when a BMS tie‑in is required.
What environments do you support?
From clean‑rooms to wash‑down food plants and outdoor exposure, we offer NEMA 1 and NEMA 4 enclosures, corrosion‑resistant hardware, and cold‑start profiles for sub‑zero applications.
