Removing a dedicated machine room can free roof-level or adjacent floor area, but it does not remove the elevator’s machinery, clearances, support points, or service routes. By the end, you will be able to compare an MRL layout with a conventional machine-room elevator, calculate the space actually saved, and test whether the arrangement suits your building.
Key takeaways
- MRL removes the separate machine room, not the elevator machinery.
- Check hoistway width, depth, overhead, pit depth, and maintenance clearances.
- Measure usable floor area before and after removing the machine room.
- Compare electrical load, heat, noise, vibration, access, and service provisions.
What Space Does an MRL Elevator Actually Remove?
A machine room-less elevator removes the separate penthouse or adjacent machine room, not every piece of elevator equipment. The traction machine, controller, governor, brake equipment, and maintenance clearances remain within the hoistway or in a dedicated hoistway-side space.
An MRL elevator is commonly a traction elevator using a gearless permanent-magnet machine. Its traction machine location near the top of the hoistway saves a separate room, but heat dissipation, safe technician access, and replacement routes still require space.
| Feature | MRL elevator | Conventional machine-room elevator |
|---|---|---|
| Shaft dimensions | Equipment fits inside or beside the hoistway; shaft width and depth depend on the selected layout | Shaft is paired with a separate machinery room; the shaft may not contain all drive equipment |
| Overhead height | Not automatically lower; machine and code clearances still apply | Machine-room arrangement can require a taller roof structure |
| Pit depth | Not automatically shallower; car, counterweight, governor, and code clearances govern | Separate machinery does not remove pit requirements |
| Equipment access | Access is from the landing, pit, car top, hoistway, or dedicated side space | Technicians reach the machine in a room with more direct working space |
| Usable floor area | Removes the dedicated machine-room footprint and roof volume | Uses a machine-room footprint above or beside the shaft |
| Planning constraints | Tight access, ventilation, structural supports, and replacement logistics need early coordination | Machine-room size, access route, floor loading, and roofline need coordination |
Do not assume MRL reduces overhead or pit depth. The selected machine, roping ratio, counterweight location, car design, speed, and local code determine those dimensions.
Before approval, check:
- Certified shaft width, shaft depth, pit depth, overhead clearance, travel, and floor-to-floor heights
- Rated load, speed, traffic demand, car and door sizes, and counterweight position
- Structural support points for rails, brackets, divider beams, and machine reactions
- Safe access to the machine, brake, governor, controller, and car-top equipment
- Fire strategy and the governing local elevator code
MRL suitability depends on rated load, travel, traffic demand, fire strategy, and code—not on the label alone.
Which Building Dimensions Must You Check Before Selecting MRL?
A proposed shaft accommodates an MRL system only after its MRL elevator dimensions are matched to a certified manufacturer layout, not a generic catalogue label. Check these items before requesting a quotation:
- Shaft width and depth, pit depth, overhead clearance requirements, total travel height, and floor-to-floor height
- Rated load, rated speed, traffic pattern, car dimensions, and door width and height
- Counterweight position, guide-rail lines, divider beams, brackets, and available structural support points
| Dimension or feature | Why it matters | What to request |
|---|---|---|
| Pit and overhead | Determines refuge, rescue, governor, and car-top working zones | Code-compliant clearances |
| Machine position | Sends reactions into rails, brackets, beams, or surrounding structure | Support reactions and fixing details |
| Car and doors | Controls usable capacity, landing fit, and traffic flow | Car, door, and entrance drawings |
| Roping arrangement | Changes torque, power, rope travel, and shaft geometry | Sheave locations and rope paths |
Require the layout to show machine position, rail loads, overhead refuge and rescue clearances, governor arrangement, car-top access, and pit working zones. Two-to-one roping can reduce machine torque and power, but adds sheaves, rope-bending points, longer rope travel, inspection items, and tighter geometric demands.
Identify the authority having jurisdiction and governing edition before comparing dimensions: EN 81-series standards with the EU Lifts Directive, or ASME A17.1/CSA B44 with local building and fire requirements. The final drawing must be reviewed by the structural and elevator designers.
How Do You Calculate the Space You Will Actually Save?
The genuine space saved by an MRL elevator equals the eliminated machine room footprint minus every new area needed to house, reach, support, and replace its equipment. A smaller roof plan is not a gain if the machinery simply occupies valuable adjacent floor area.
| Area item | Add or subtract | What to measure |
|---|---|---|
| Eliminated machine room footprint | Subtract | Dedicated room on the roof or beside the shaft |
| Controller cabinet zone | Add | Cabinet depth, door swing, and working clearance |
| Hoistway-side machinery space | Add | Machine, brake, traction sheave, and governor zone |
| Access route | Add | Landing, pit, car-top, or service path |
| Electrical equipment area | Add | Disconnects, drives, and protective equipment |
| Refuge or rescue clearance | Add | Code-required protected working volume |
| Structural support zone | Add | Thickened slabs, beams, brackets, and load-transfer areas |
Calculate the net area separately on each affected floor, including the roof or adjacent level: eliminated footprint minus all added zones. Record the result as square metres per floor, not as a single building-wide claim.
A controller cabinet in a landing-side recess can improve planning only if it has lockable access, ventilation, water and dust protection, safe working clearance, and separation from occupants. Maintenance access must also reach the machine, brake, traction sheave, governor, controller, and car-top equipment without exposing technicians to moving equipment.
Before approving the saving, document replacement logistics. Confirm how a drive, motor, brake component, or controller enters the building, reaches its location, and leaves without dismantling finished construction. A layout that wins floor area but traps heavy components is a poor trade.
What Electrical, Thermal, Noise, and Vibration Conditions Does MRL Require?
Treat an MRL hoistway as an equipment room: motor, drive, brake, and controller heat require MRL elevator ventilation or approved temperature control. The equipment schedule and building-services design must state permissible shaft temperature and humidity ranges; do not assume a machine-room-free layout needs no environmental treatment.
1. Specify moisture protection against leaks and condensation, dust control, adequate fixed lighting, safe working clearance, lockable equipment access, and isolated power supplies for lift equipment, lighting, and emergency systems. Protect landing-side cabinets and wall recesses from unauthorised access without blocking technician entry.
2. Put occupied rooms beside the shaft—bedrooms, offices, hospitals, and hotel rooms—into the acoustic brief. State noise limits, structure-borne vibration limits, and measurement locations, then verify them during commissioning rather than treating the MRL label as an acoustic guarantee.
3. Require resilient machine isolation, suitable shaft-wall construction, accurate guide-rail alignment, correct sheave and rope condition, and brake adjustment. These details control structure-borne noise and vibration; a poorly aligned rail or dragging brake can transmit disturbance through the building even with good wall construction.
4. Record elevator equipment temperature, humidity, acoustic assumptions, and maintenance clearances on the approved layout. Check that heat does not damage electronics, moisture does not corrode brake parts, and dust does not foul cooling paths.
5. Document the power-failure rescue method before installation. Permanent-magnet gearless systems may need approved brake-release equipment, a rescue drive, battery supply, or another authorised procedure for moving the car and releasing trapped passengers. Test that procedure during commissioning.
How Should You Compare an MRL Proposal With a Conventional Elevator?
The better option is the one that delivers the stronger whole-building result, not the smallest machine-room drawing.
| Comparison | MRL | Conventional elevator |
|---|---|---|
| Space and roofline | Removes separate room; may reduce penthouse height | Requires dedicated machine-room area and structure |
| Access and service | Hoistway, landing, pit, or car-top access must work safely | Equipment is usually easier to reach |
| Building work | May need shaft supports, thermal control, acoustic treatment, and special access | Adds room construction, but simplifies equipment access |
| Lifecycle performance | Check energy use, commissioning, replacement routes, and service time | Compare the same measures, including room upkeep |
Use this elevator procurement checklist. Ask every bidder for:
- A certified general-arrangement drawing, shaft dimensions, support reactions, controller location, working clearances, and installation access route.
- Environmental limits, thermal provisions, acoustic assumptions, governing code edition, commissioning requirements, rescue procedure, and emergency rescue equipment.
- Maintenance routes, component-replacement method, energy-use data, and estimated elevator lifecycle cost, including elevator installation and maintenance time.
An MRL premium is justified by a constrained roof, valuable adjacent floor area, or a project where a shorter penthouse simplifies planning. A conventional machine room may be stronger for difficult hoistway access, high traffic demand, demanding service conditions, or restricted technician access.
Firefox Elevators Private Limited can coordinate manufacture, component supply, installation, maintenance, and repair against measured constraints; judge the MRL versus conventional elevator decision on documented layout and lifecycle evidence.
Frequently asked questions
What space does an MRL elevator remove?
An MRL elevator removes the separate penthouse or adjacent machine room. Its traction machine, controller, governor, brake equipment, and maintenance clearances remain in the hoistway or a dedicated hoistway-side space.
Which building dimensions must you check before selecting MRL?
Check the hoistway width and depth, pit depth, overhead height, landing-door dimensions, machine and controller location, access route, and every required maintenance clearance.
How do you calculate the space an MRL elevator saves?
Measure the machine-room floor area that a conventional elevator requires, then subtract any hoistway-side equipment room, access zone, and added service space required by the MRL design.
What should you compare between an MRL and conventional elevator proposal?
Compare the total shaft and service footprint, rated load and speed, electrical demand, heat rejection, noise, vibration, emergency access, maintenance access, and the full installation scope.
