Air Purifier for a Guest room: What Size You Need

What the published table gives a guest room#

A floor between the 100 and 200 sq ft rows takes 130 cfm; smaller floors take the 65 cfm row, larger ones the 195. The rounding rule is the site-wide one: between two rows, take the larger.

Same sizing as a bedroom, different calendar#

Start the machine hours before a guest arrives, not minutes. Clean air is delivered in real time, an hour of panic cannot repay a season of nothing.

While they stay, run it as you would a bedroom: low, continuous, door position matching reality.

The smoke CADR, and why it matters here#

EPA advises comparing the tobacco-smoke CADR when small particles are the concern, because it represents the smallest of the three tested classes. Smoke, a guest’s habit or a neighbour’s drift, is the finest-particle problem a guest room meets.

The honest order of operations: no indoor smoking first. A purifier is rated for the particles that remain, not permission for the habit.

Compare bedroom-sized units on the smoke column and the low setting; guests notice both.

Placement and running#

• Near the bed but not blowing at it, out of the curtain line.
• Run before the visit and during; rest it after.
• Make the bed with it running, linen sheds, and resuspended dust is exactly its job.

What the box leaves out#

Guest-room odour claims, air fresheners especially, have no published number behind them. The rated work is particles; the smells are gases.