Entryway

Why this carrier here

A 3.4 m2 entry hall with the front door on one side and a coat rail on the other behaves more like a corridor than a room. Air is exchanged five to seven times an hour while people come and go, then goes completely still once the household is home. That stop-start cycle is the single fact that decides which carrier survives here.

The floor is usually the coldest surface in the flat and the wall beside the door is the most temperature-stable. Hanging a carrier high on the door-side wall keeps it out of the draught band that runs at ankle height, and keeps the scent from being stripped out every time the door opens.

Because dwell time is short — most households spend under a minute at a time in the entry — a carrier has to work at a distance. Anything that only smells within arm's reach reads as nothing at all here.

Same room, other rung

Rung	Covers	One fill lasts	Rung matrix
L1	Barely there 1–5 m2	1-5 m2 of treated surface or enclosed volume; one sachet, one small plaque, two sprays on a cushion.	A five-reed diffuser for a 3.4 m2 entryway that never gets opened twice
L2	Close range 3–12 m2	3-12 m2; one 40-60 g wax tablet, one 60-90 g plaque, a four-reed diffuser, or three sprays on upholstery.	A 35 g sachet hooked on the coat rail of a 3.4 m2 entryway
L3	Half the room 10–26 m2	10-26 m2; a six- to eight-reed diffuser, two plaques at opposite ends, or a diffuser plus a stone.	in preparation
L4	Whole room 18–30 m2	18 m2 and up, or any open-plan volume; two eight-reed diffusers, a diffuser plus two stones, or a diffuser plus a textile pass.	in preparation

2 live plan(s)

• A five-reed diffuser for a 3.4 m2 entryway that never gets opened twice (L1 · 32 d · CNY 21)
• A 35 g sachet hooked on the coat rail of a 3.4 m2 entryway (L2 · 34 d · CNY 11)