The Complete B2B Buying Guide: Air Curtains, PVC Strip Curtains, Insect Killers & Washroom Automation

Choosing industrial hygiene and climate-control equipment is a specification exercise, not just a price comparison. The right air curtain, PVC strip curtain, insect killer or washroom-automation unit depends on your door size, traffic, site conditions and compliance needs. This guide walks purchase officers, facility managers and export buyers through the decisions that matter for each category, with practical numbers and a final checklist you can attach to a tender or enquiry.

Before You Compare Quotes: Five Questions

Most buying mistakes trace back to skipping the basics. Before you shortlist a model, settle these five points, because they drive every specification that follows:

• What is the exact clear opening? Measure the width and the height of the open doorway, edge to edge, not the wall.
• How heavy is the traffic? A door that opens a few times an hour is a different problem from one that opens hundreds of times.
• What are you trying to keep out (or in)? Conditioned air, dust, fumes, flying insects, or a mix—this changes the product entirely.
• What are the site conditions? Outdoor wind, dust load, temperature, washdown areas and food-safety zones all narrow the choice.
• What is the budget basis—capex or total cost? The cheapest unit is rarely the cheapest over five years once energy and replacements are counted.

How to Choose an Air Curtain

An air curtain is sized to its doorway. The single most important rule is that the unit must be at least as long as the door is wide, and its throw must comfortably exceed the door height. Under-sizing on either axis produces a weak barrier that wastes energy without solving the problem.

Match the unit to mounting height

Mounting height	Recommended class	Typical discharge velocity	Typical use
Up to 2.5 m	Standard commercial	8–10 m/s	Shops, clinics, offices, restaurants
2.5–3.5 m	Premium commercial	10–12 m/s	Showrooms, hotel lobbies, hospital entrances
3.5–5.0 m	Industrial duty	12–16 m/s	Warehouses, factories, loading docks, cold-store anterooms

Get the air velocity right

Aim for at least 2.5 m/s of air velocity reaching the floor for commercial doorways and around 4 m/s for industrial and cold-storage openings. Because the stream slows as it travels down, the discharge velocity at the nozzle is normally three to four times the floor target. If a quote lists only motor wattage and not velocity or CMH, ask for the full specification before comparing.

Decide heated or unheated, and pick the motor

In most Indian cities an unheated (ambient) air curtain is the correct, more economical choice; reserve heated units for cold-chain docks, frozen anterooms and hill-station premises. Where the entrance is noise-sensitive—a lobby, ward or fine-dining space—specify an EC motor or a unit rated ≤62 dB(A) at 3 m so you get the velocity you need without the roar.

How to Choose a PVC Strip Curtain

Strip curtains are chosen by strip size, overlap and grade. Start with the strip dimensions, then set the overlap for how tight a seal you need, then pick the grade for the environment:

Requirement	Strip size	Overlap	Grade
Light / medium foot traffic	200 mm × 2 mm	30%	Clear
Wide opening, forklift traffic	300 mm × 3 mm	30–50%	Ribbed
Cold room / freezer	200–300 mm × 2–3 mm	50–100%	Polar (−40 °C)
Food storage / insect-sensitive	200 mm × 2 mm	50%	Anti-insect (amber)
Welding / fabrication bay	200 mm × 2 mm	30%	Welding (amber, UV-blocking)

Higher overlap insulates better but uses more material and is harder to push through, so match it to genuine need. For air-conditioned offices and clean areas, a magnetic self-closing strip curtain gives a tighter seal than plain hanging strips. Always choose a hook-and-rail header that lets you replace individual strips, because in a busy doorway some strips wear faster than others.

How to Choose an Insect Killer

The deciding factor is where the unit will hang, because food-safety rules dictate the technology:

• Food-prep, storage and front-of-house areas: use a glue-board (sticky-board) unit. It captures insects intact, so there is no fragmentation or debris near food.
• Non-food areas such as corridors, bin stores, loading bays and plant rooms: an electrocution (zapper) grid unit is acceptable and often cheaper to maintain.

Size by coverage area, then refine by placement. A unit rated for your floor area still underperforms if it competes with daylight, so mount it away from windows and external doors, not directly above open food, and at the height the manufacturer specifies. Budget for annual UV-tube replacement and—on glue-board models—routine board changes, because effectiveness falls quietly as tubes age and boards fill.

How to Choose Washroom Automation

Touchless washroom fittings cut water use and cross-contamination in high-footfall sites. Specify by the trio of hand-wash points—sensor tap, automatic soap dispenser and high-speed hand dryer—plus sensor flush valves on WCs and urinals. Check three things on every quote: the power option (mains adaptor or battery), the sensor range and adjustability, and whether a serviceable solenoid valve and accessible batteries are used, since these determine running cost and uptime far more than the shell design.

For Export & Bulk Buyers: Commercial Checklist

If you are buying in volume or importing, the commercial terms matter as much as the specification. Confirm these before you place a purchase order:

Item	What to confirm
MOQ & price tiers	Minimum order quantity and the quantity breaks that improve unit price
HSN & GST	Air curtain 8414 59 10, PVC strip 3920 49 00, electric insect killer 8516 79 20 — generally 18% GST
Documentation	Proforma invoice, tax invoice, packing list, and IEC details for export
Incoterms	EXW, FOB or CIF — who bears freight, insurance and duty, and where risk passes
Payment terms	Advance, LC, or an approved Net 30 / Net 60 credit line for repeat buyers
Lead time & warranty	Dispatch time for stock vs custom sizes/voltages, and the warranty plus spare-part availability

Quick Selection Checklist

• Air curtain length ≥ door width, and throw > door height.
• Floor velocity ≥ 2.5 m/s commercial, ≥ 4 m/s industrial / cold storage.
• PVC strip grade matched to environment (clear, ribbed, polar, anti-insect, welding) with the right overlap.
• Glue-board insect killers in food zones; grid units only in non-food areas.
• Washroom units checked for power option, sensor range and serviceability.
• Commercial terms—MOQ, GST/HSN, Incoterms, payment and warranty—agreed in writing.

Need help turning these criteria into a specific model and quote? Explore the full range, size a doorway with the strip-curtain calculator or ROI calculator, or request an instant quote. For definitions of any term above, see our industry glossary.