MEP Design for a Mall: HVAC Zoning, Tenant Interfaces and Smoke Control

MEP design for a mall is a base-build design with defined interfaces for tenants. The landlord provides chilled water or condenser water, power at metered tap-off points, fire-fighting and smoke-control systems, and common-area services. Each tenant fits out from those points. The design succeeds when the boundary is drawn early, the zoning follows the leasing plan and the smoke-control scheme is designed with the fire authority.

Where does the landlord's scope end and the tenant's begin?

Most mall disputes come from an unclear boundary. Draw it on a matrix at design stage and attach it to every lease. Our article on the base-build and fit-out boundary explains the principle; the table below applies it to a mall.

How should the HVAC be zoned and metered?

Zone to the leasing plan, not the architect's grid. Large-format anchors, multiplexes, food courts, entertainment zones and inline shops have different hours, loads and ventilation needs, so each should be able to start, stop and be billed independently. A central chilled-water plant serving several zones, with a valved tap-off and a metering decision at each tenant connection, is common, but whether the tenant is billed on thermal energy, electrical sub-meter readings or an area-based charge is a lease and design choice. The Energy Conservation Building Code (ECBC 2017, amended to 2020) provisions we reviewed deal with electrical sub-metering and we found no requirement for chilled-water metering, so plan thermal metering as a landlord decision.

The same Code applies to buildings with a connected load of 100 kW or a contract demand of 120 kVA or more, so a mall will normally fall within it where the state has adopted it. For a tenant-based building, it requires that tenants are provided with tap-off points to install electrical sub-meters, and lists façade lighting, and elevators, escalators and moving walks as services to be sub-metered in a shopping complex. It limits air-cooled chillers to 33% of installed chilled-water capacity where the cooling load is 530 kW or more, unless the authority requires otherwise, and asks for BEE star-rated chillers. For core-and-shell malls, it requires the tenant lease to carry an undertaking that fit-outs will comply with the Code. The Ministry of Power's year-end review notes that a newer Energy Conservation and Sustainable Building Code, introduced in 2024, applies to buildings of 100 kW or more, which it says includes shopping malls, and that states may adopt it, so check which edition your state applies. Our ECBC compliance guide and sub-metering and CAM note go further, and the chiller capacity calculator gives a first plant-size estimate.

What does smoke control involve in a mall?

The National Building Code of India, 2016, Part 4 treats a mall as occupancy D-6: a building with mixed assembly and mercantile use, such as shops with cinemas, multiplexes and food courts. A BIS successor edition has been reported, so confirm which edition your fire authority enforces. Under the 2016 text, the provisions that shape MEP design include the following.

• Cinemas and multiplexes are located so their exits are separate and lead directly to exit discharge. The common path of travel is 30 m, the dead end is limited to 6 m and exit passageways are at least 2.0 m wide.
• Half of the lifts in common areas have fireman's-lift features, manual call points are of the break-glass type, and upper-level parking next to shops, food courts or multiplex is separated by 120-minute fire-rated construction.
• Refuge area of at least 10% of the floor area is provided at or immediately above 18 m, with a further refuge area at or above 24 m.
• A fire command centre is established, and a qualified Fire Officer with at least three years' experience is appointed for D-6 occupancy.

Annex F deals with atriums, which many malls have. The Code lets an atrium be permitted only in Type 1 and Type 2 construction, requires beam or aspirating smoke detection within it, and specifies smoke extraction of 6 air changes per hour for atriums in business occupancy and 8 for hotels and assembly occupancy, applied over the top 15 m of the space. Which figure a mixed assembly and mercantile mall atrium takes is for the fire authority and your fire engineer to settle. The same Annex requires smoke exhaust fans able to operate at 250°C for 120 minutes, make-up air recommended at 85% to 95% of the exhaust flow with velocity limited to 1.02 m/s where it meets the plume, and emergency power for the atrium smoke-management fans.

For ventilation, the Code asks for separate AHUs per floor in specified cases, 120-minute-rated shafts and ducts where they cross floors, and encourages zoned and compartmented HVAC that avoids common exhaust and fresh-air shafts. Basement parking in a mall has its own ventilation and fire requirements; see our note on basement parking ventilation and fire.

What should the design stage settle before leasing starts?

1. The load allowance per unit. Cooling, electrical and water allowances by tenant type, so leasing can promise them and the plant can supply them.
2. The DG and UPS strategy. Which loads the base-build backs up and how tenants buy backup, with metering. See tenant DG allocation.
3. Food court services. Kitchen exhaust, make-up air, gas supply, grease and drainage, set up so a late-leased unit can use them.
4. Fire engineering sign-off. The smoke-control concept agreed with the authority before tenants' ceilings are designed.
5. Tenant design criteria. A fit-out manual that restates the interface matrix, ECBC undertaking and fire requirements.

How Secured Engineers helps

Secured Engineers designs HVAC, electrical, plumbing and fire-fighting systems in-house, and files Fire NOC, CEIG and DISCOM applications in-house, so the interface matrix, smoke-control concept and approvals are drawn by one team. MEPF and solar can sit under one contract. We work from offices in Noida (Delhi NCR) and Ludhiana, and have delivered 535+ projects across 18+ states with 89.77% repeat clients.

We offer MEP design consultancy and a technical review of existing mall designs: we check your zoning, load allowances, interface matrix and smoke-control concept and mark what to settle before tenants fit out. See our design and approvals service, use the MEPF cost calculator for a first budget view, then send your drawings through WhatsApp, call +91 70099 85817 or ask for a free proposal to review your design.