First run

A purifier sized for the room it stands in

400 m³/h, sized for one room.

184 winter testers rated it 4.7 out of 5

Illustrative outdoor reading

34in the same hall, forty minutes later

400m³/h clean-air delivery

Pre-order from ₹16,400

MRP ₹19,900 · free delivery

Pre-order the R400 Check your room size

Free deliveryAnywhere in India

Sized with youSend the room

Before DecemberConfirm by 20 Nov

Why most purifiers disappoint

The machine is usually fine. The room is too big.

We borrowed thirty-one purifiers.

Coverage is quoted, then halved

A box that says 500 sq ft.

The discount is the trap

A small machine in a big hall.

One unit for the house is a myth

Air does not move that fast.

So we sized one machine properly and stopped there.

What the R400 actually does

Six things we can put a number against

400 m³/h, measured

Measured in our own test room.

Four stages

In the right order.

Sized in square feet

Before you pay.

26 dB(A) on speed one

Quiet enough to sleep beside.

A sensor you can read

The number, in µg/m³.

A filter that counts hours

Not calendar months.

Inside the R400

Four layers, one sealed path

Air enters the front face and leaves through the top.

01Washable mesh pre-filterNylon mesh for hair and lint.

02H13-grade pleated mediaThe layer that takes PM2.5.

03Carbon and zeoliteFor odour, smoke and fumes.

04Gasketed top outletClean air across the ceiling.

Specification

How the pre-order works

Order once. Then we leave you alone.

No subscription, no app account.

In the carton

Four things. No app required.

The only comparison that matters

A sized machine against a discounted one

Room it honestly covers In a 400 sq ft hall

PRANA R400400 sq ft

3.9 air changes an hour

A ₹7,999 unit130 sq ft

1.2 air changes an hour

What matters

PRANA R400

A ₹7,999 unit

The cheap unit is not defective.

38 m³Test chamber

Who built it

A sealed test room in Okhla and eleven purifiers to beat

Rohit spent nine years on extract fans.

The R400 is the fourth prototype.

Measured, not copied
Assembled in Okhla
Sensor-checked before boxing
Coverage published at 3.9 ACH

Rohit VaidyaFounder and lead engineer

Winter testers

184 homes ran it through one Delhi winter

4.7average rating

91%ran it overnight

31sized a second room

Where the test units went

184 rooms, one bad season

First run

600 units, then the launch price closes

Orders confirmed by 20 November are dispatched before December.

00Days

00Hours

00Minutes

00Seconds

Confirm by 20 November.

The first run, in numbers

Only 174 of 600 units are unspoken for — reserved so far.

Reserve a unit

Pre-order

Reserve the R400 for a room you have measured

Choose a pack and tell us the room.

Choose your pack

Sizing check firstWe confirm the pack fits your room.

Two-year warrantyFive years on the fan motor.

30-day returnSend it back if the numbers do not move.

Free deliveryAnywhere in India, insured.

Before you order

Seven questions, answered flatly

Not this winter?

Ask us about the February run

Leave an email and we will write once.

A purifier sized for the room it stands in

The machine is usually fine. The room is too big.

Coverage is quoted, then halved

The discount is the trap

One unit for the house is a myth

Six things we can put a number against

400 m³/h, measured

Four stages

Sized in square feet

26 dB(A) on speed one

A sensor you can read

A filter that counts hours

Four layers, one sealed path

Specification

Order once. Then we leave you alone.

Four things. No app required.

A sized machine against a discounted one

A sealed test room in Okhla and eleven purifiers to beat

184 homes ran it through one Delhi winter

184 rooms, one bad season

600 units, then the launch price closes

The first run, in numbers

Reserve the R400 for a room you have measured

Your pre-order

Ready to send

Seven questions, answered flatly

Ask us about the February run