Vertical blinds are the most frequently mis-ordered window covering we see in Kolkata homes. Almost every other blind gets chosen for how it looks. A vertical blind has to be chosen for how the window is shaped — and when that one rule is ignored, the room never quite settles, however good the fabric was.

We have been fitting window coverings from 46 Central Avenue since 1971, and vertical blinds are a product we recommend without hesitation for some openings and actively talk customers out of for others. This guide is the conversation we have across the counter, written down.

What a vertical blind actually is

A vertical blind hangs wide vanes — fabric or PVC — from a track at the top. Each vane sits on its own carrier and rotates on the spot when you turn the wand, so you can tilt light in or shut it out without moving the blind at all. Pull the chain and the whole set stacks to one side, the way a curtain draws, instead of lifting upward the way a roller blind, a Roman blind or a honeycomb blind does.

That single mechanical difference — sideways rather than upward — is the whole case both for and against vertical blinds. It is exactly why they suit a sliding balcony door, and exactly why they feel like too much hardware on a small bedroom window.

The question that decides it: is the window wider than it is tall?

This is the first thing we ask, and it settles most enquiries in about ten seconds.

If the opening is wider than it is tall — a sliding balcony door, a long living-room window, a stretch of office glazing — a vertical blind is usually the most sensible thing you can fit. A roller blind across a ten-foot span needs a heavy tube and, once it is down, it is down across the whole run. A Roman blind at that width gathers into a deep stack that swallows the top of the glass. Vertical vanes carry their own weight individually, so width costs you very little, and when you draw them back they park in a narrow bundle at one end and leave the doorway completely clear.

If the window is taller than it is wide — the standard Kolkata bedroom window, a kitchen window above a counter, a narrow stair light — verticals will read as too much mechanism for too little glass. Send that window to a roller, a Roman or a wooden blind instead.

The ceiling fan problem no imported guide mentions

Search for advice on vertical blinds and you will land on British, American or Australian retailers. Their guidance is sound as far as it goes, and none of it accounts for a ceiling fan turning two feet away, because ceiling fans are not standard fittings in those homes. In Kolkata they are in nearly every room.

A vertical vane is a free-hanging panel, weighted at the bottom and, on most systems, linked to its neighbours by a small chain. Put a fan on medium or high near it and the vanes lift, swing and knock against each other. It is a soft sound, but it is a persistent one, and in a bedroom it is enough to keep a light sleeper awake. This is the single most common complaint we hear from people who bought vertical blinds elsewhere and now dislike them.

It is not a reason to rule them out. It is a reason to plan around the fan:

• Fit the blind outside the reveal and slightly proud of the wall, so the vanes hang clear of the airflow rather than in a channel with it.
• Ask whether the system can be supplied without the linking bottom chain; a free-hanging vane with a properly seated weight moves less, not more, than a chained one being tugged from both ends.
• Choose PVC vanes over loose fabric where air movement is constant — they are stiffer and settle faster.
• If the fan sits more or less directly over the window, which happens whenever the window is on the long wall of a narrow room, fit a roller or Roman blind and be happy.

Fabric vanes or PVC vanes?

Both are made to the same width and hang from the same track, so the choice is about the room, not the mechanism.

Fabric vanes soften a room. They diffuse light rather than block it, they take colour and weave beautifully, and in a living room or a conference room they stop the window reading as purely functional. They are the right answer wherever the blind is part of the decorating scheme.

PVC vanes are the practical choice. They wipe clean with a damp cloth, they do not hold moisture through a Kolkata monsoon, and they shrug off the fine road dust that settles on any street-facing frontage in central Kolkata. For a factory floor, a clinic, a bank counter or a shop front, PVC is what we would fit in our own premises. The same logic drives our recommendations for offices, factories and commercial kitchens.

Where vertical blinds earn their place

Where	Vertical blinds?	Why, or what we would fit instead
Sliding balcony door	Yes — first choice	Vanes stack sideways and clear the doorway completely; nothing else handles a door you walk through as cleanly.
Wide living-room window	Yes, in fabric	Width costs you almost nothing, and fabric vanes keep the room from feeling like an office.
Office glazing, conference rooms	Yes	Glare control by tilt rather than by height, so the room stays bright while screens stay readable.
Shop front or showroom	Yes, in PVC	Wipes clean, tolerates dust, and one damaged vane is replaced rather than the whole blind.
Standard bedroom window	Usually not	Too much hardware for the glass, and fan-driven vane movement is worst in the room where you notice it most. Fit a roller, Roman or blackout curtains.
Kitchen over a counter	No	Grease clings to vane edges and the wand is awkward across a worktop. PVC roller blinds are the correct product here.

Where we would talk you out of them

A vertical blind will not give you a genuinely dark room. Light passes at every vane join and along the top track no matter how well the blind is made, so if the requirement is real darkness for a night-shift sleeper or a nursery, the honest answer is blackout curtains, not vanes.

They are also the wrong instinct if you want the window itself to be decorative. A vertical blind is a clean, quiet, competent piece of engineering; it is not a feature. Where the window is meant to carry the room, a Roman blind or a wooden blind will do far more for it. And if the appeal is the ability to dial daylight up and down through the day rather than the width of the opening, look at zebra blinds before you commit.

What to check before you order

• Which side the stack parks. On a sliding door the vanes must gather on the side you do not walk through. Decide this before the blind is made, not on fitting day.
• Inside or outside the reveal. Inside gives a neater line; outside covers a deep sill, clears a window AC unit and keeps vanes away from grilles.
• Vane width. Two standard widths are offered. The narrower one suits domestic windows and stacks tighter; the wider one reads calmer across a long commercial run.
• Floor clearance. A floor-length vertical should finish a little clear of the floor. Vanes that brush the tiles will fray and hang crooked within a season.
• Control side and cord safety. The chain should be tensioned to the wall, particularly in a home with small children.
• Replaceability. Ask whether single vanes can be replaced later. On a large office install this is the difference between a small repair and a whole new blind.

If you are measuring yourself before you visit us, the same principles we set out in our guide to measuring for curtains apply to a vertical blind track. If you would rather not, our measurement is free and takes about twenty minutes.

Verticals can also be motorised, which is worth considering on high or hard-to-reach office glazing. We cover that in our guide to motorised blinds and on our motorised blinds page.

Frequently asked questions