PVC Strip Curtain Doors: Grades & Specs Guide India 2026

PVC strip curtain doors are the cheapest, fastest-deployed barrier in the industrial door family — a row of overlapping flexible PVC strips hung on a rail, parting as people and forklifts pass and snapping back to re-seal. They will never match a powered door for air-tightness, but for a fraction of the cost they cut heat exchange, keep dust, fumes and flying insects out, dampen noise, and hold a temperature gradient between two zones. For Indian warehouses, cold rooms, kitchens and factories where the opening sees constant low-speed traffic and a sealed leaf would simply be propped open, a well-specified strip curtain is often the correct engineering answer. This guide covers strip width and thickness, the all-important overlap percentage, the grades, mounting, cost per sqft, and the honest line where a curtain stops being enough and a high-speed door earns its keep.

What PVC strip curtain doors actually do

A strip curtain is a passive barrier, not a seal. Each strip is a hanging blade of flexible PVC; overlapped with its neighbours it forms a near-continuous membrane that still yields instantly to a passing trolley or person. Because it self-closes by gravity, there is no operator, no power, no cycle count to wear out, and effectively no failure mode beyond the strips themselves clouding or tearing. That simplicity is its whole value proposition.

The four jobs a PVC strip curtain doors installation is bought to do in India:

• Thermal separation — holding a chiller, freezer or air-conditioned zone against ambient. The curtain does not insulate like a cold storage door; it limits the bulk air exchange that happens every time an opening is left clear.
• Dust, fume and draught control — keeping grinding dust, paint overspray, exhaust and wind-blown grit out of a clean process area or warehouse.
• Pest and insect exclusion — a physical and (with amber/yellow strips) visual deterrent that supports FSSAI hygiene and HACCP in food units.
• Noise attenuation — a modest cut to transmitted machine noise between bays; not a substitute for an acoustic door.

Strip width, thickness and the overlap rule

Three numbers define a curtain's performance: strip width, strip thickness (gauge), and overlap percentage. Get the overlap wrong and the other two barely matter.

Strip width and thickness

Wider, thicker strips sit heavier, hang straighter in a draught and seal a taller opening; narrower strips deflect more easily for frequent pedestrian traffic. As a rule of thumb, match the strip to the opening height and traffic type.

Thicker strips resist curling and cold-stiffening, hang stable in wind, and last longer under forklift impact — but cost more and need a stronger rail. For most Indian factory and warehouse openings, 200 mm or 300 mm strips at 2-3 mm are the workhorse.

Overlap percentage — the number that matters most

Overlap is how much each strip covers its neighbour. It is the single biggest driver of sealing performance, and the chief reason a cheap curtain underperforms.

Higher overlap means more PVC and so more cost — moving from 33% to 100% roughly doubles the strip material — but it is the only way to get a freezer or a hygiene-critical room to actually hold its gradient. Specify overlap explicitly on the order; a vendor quoting a suspiciously low rate has usually assumed flat-hung strips.

Material grades — clear is not the only option

The base polymer is plasticised PVC, but the grade must match the environment. Using standard clear strips in a freezer is the most common and most expensive specification mistake — they go brittle, crack and shatter.

Match the grade to the room before you size the strips. A pharma or cleanroom anteroom may need anti-static or fully transparent crystal-clear PVC; a coastal food unit needs amber insect-repellent; a freezer mandates polar-grade. The price step between grades is real — polar and anti-static grades carry a premium — but the wrong grade fails fast and is a false economy.

Mounting and hardware

The curtain is only as reliable as the rail and the way strips attach to it. The two common systems:

• Bolt-on flat hangers — strips bolted to a fixed steel rail. Cheapest, robust, but a torn strip means unbolting; suited to low-traffic openings.
• Hook-on / sliding bracket — each strip clips to a stainless hook on a rail, so a damaged strip is swapped in seconds without tools. Standard for busy industrial doors and the right choice where downtime costs money.

Mount the rail on the warm/clean/positive-pressure side of the opening so the curtain is pushed shut, not blown open. Strips should clear the floor by 25-50 mm (closer for pest control, more for ramped forklift routes). For very wide vehicle openings, hang an inner pedestrian curtain or pair the strip curtain with a sliding or sectional door for after-hours security — a strip curtain offers zero security and no fire rating.

How the strips overlap and re-seal

Cost per sqft and what drives it

A PVC strip curtain is one of the lowest-cost barriers per sqft of any door type. As a rule of thumb for India in 2026:

Rates are supply-only; add the rail, hardware and installation, and add 18% GST. Cost scales with overlap (more PVC), thickness, grade and rail hardware. A typical single warehouse opening landed often runs a few thousand to ₹15,000-25,000 rupees installed — an order of magnitude below a powered door. Use the door cost calculator for a budget figure, and where you are weighing a curtain against a powered opening, the high-speed door savings calculator helps justify the step up. Always get a written vendor spec stating grade, width, thickness and overlap — that is where quotes legitimately diverge.

When a strip curtain is enough — and when it is not

A strip curtain is the right call when the opening sees frequent, low-speed traffic, when a sealed leaf would simply be propped open all day, when there is no security or fire requirement at that opening, and when a modest reduction in air, dust and pest ingress is acceptable. It is the classic pairing for a cold room, a kitchen pass, a despatch bay or between two factory zones.

Move up to a high-speed door or an insulated industrial door when you need a genuine air-tight seal, when energy modelling shows the curtain's residual leakage costs more than the door, when high wind blows strips open, when hygiene audits demand a hard washable barrier, or when the opening needs security, fire rating or a defined cycle life. Strip curtains and high-speed doors are not rivals — the best cold-chain and pharma installations use both, with a curtain behind the fast door as a redundant barrier, often alongside an air curtain. For a fuller map of the door family see the complete door guide and the engineering-grade specialty doors overview.

Whatever you specify, treat the strip curtain as a project-engineered product: the final grade, strip width, thickness and overlap should come from a vendor against your actual opening, traffic and temperature gradient, not from a catalogue default.

Frequently asked questions

What overlap percentage should I specify for a cold room?

For chillers and freezers specify at least 50% overlap, and 66-100% (double overlap) where you must hold a hard temperature gradient. Flat-hung or low-overlap strips leak too much cold air to be worthwhile in cold-chain use, and the extra PVC for higher overlap is cheap insurance against energy loss.

Will standard clear PVC strips work in a freezer?

No. Standard clear PVC stiffens and cracks below roughly 0°C and shatters in a freezer. Specify polar / freezer-grade PVC, which stays flexible down to about -40°C. It costs more per sqft but is the only grade that survives the duty; standard strips in a freezer are the most common specification mistake.

Can a PVC strip curtain replace a high-speed door?

For frequent low-speed traffic where some leakage is acceptable, yes — at a fraction of the cost. But a curtain is a passive barrier, not a seal, and offers no security, no fire rating and no defined cycle life. Where you need a true air-tight or temperature-tight seal, high wind resistance, or hygiene-grade washability, use a high-speed or insulated door, often with a strip curtain behind it as a second barrier.

Do strip curtains help with pest and insect control?

Yes. The physical overlap excludes flying insects, and amber or yellow insect-repellent grades use a wavelength insects avoid, supporting FSSAI and HACCP hygiene in food units. Keep the floor gap small (25-50 mm) and maintain high overlap for best results.

How much does a PVC strip curtain cost in India?

As a rule of thumb, supply-only rates run about ₹120-220/sqft for standard clear strips, rising to ₹350-700/sqft for polar, anti-static or amber specialty grades at high overlap. Add rail, hardware, installation and 18% GST. A single warehouse opening is often a few thousand to ₹15,000-25,000 rupees installed — far cheaper than any powered door. Get a written vendor spec, as price tracks grade, thickness and overlap.

Which side of the opening should the rail be mounted on?

Mount the rail on the warm, clean or positive-pressure side so air pressure pushes the curtain shut rather than blowing it open. Use hook-on brackets for busy openings so a torn strip can be swapped in seconds, and keep a 25-50 mm floor clearance — tighter for pest control, more on ramped forklift routes.