Let me clear up the confusion for the sign writer and anyone else who needs some help with these commonly confused pairs:
Breath is a noun. It’s the thing you take in when you inhale and let out when you exhale.
“Take a deep breath,” the doctor said as he placed the stethoscope on my back.
Breathe is a verb. It’s what you do when you take a breath.
Breathe through your nose to avoid getting a dry throat.
Here’s a device to help you get the spelling right:
breathe (the verb) has two e’s, breath (the noun) only one.
And don’t forget breadth. It’s also a noun. It means distance.
The prince traveled the length and breadth of the land looking for the princess.
Now, isn’t it a breath of fresh air to have that cleared up?