At low speeds i hear a ticking or clicking sound, not quite a rattle, coming from the motor. Might be motor noise. Is this common? It's pretty loud.

I hear the noise too. I received mine today, and the noise doesn't really bother me. I'll see how it goes. If I can't tolerate it, I'll return the product. It sits in my living room, next to my couch. So usually the TV will drown out any clicking/ticking/rattling. Plus the fans/air kinda mask the noise. I don't really expect it to be a problem. It's likely the motor. I bet all units sounds the same.

Fan/motor noise mentioned in numerous ratings. This suggests cheap bearing(s) - probably sleeve type, not ball bearing. Anyone have fan/motor seize?

I heard Levoit will be releasing quieter 600S models in the future to address the motor noise. The older 600S models are already being phased out. I talked with Levoit customer support myself.

For a 1400 sqft two story house, is one of these enough, or is it better to have a smaller one per room, or one per floor?

I have a condo, about 800 SQFT. I have a 600S in the living room that cleans the whole condo, if I leave all the interior doors open. I put a smaller 200S in my bedroom, so I can still have purified air while the door is shut. So, incase you want to live with all interior doors open, you'll need to buy smaller units for rooms where you regularly close the door for extended periods of time.

For the everest air model, which of the sensors pm1,pm 2.5,pm10 will tell you that you may have mold in the air?

The PM value (1.0, 2.5, or 10) refers to particulate matter (PM) less than or equal to 1, 2.5, or 10 microns in size. Please note that mold can vary in size and the sensor cannot distinguish different types of particles.

ASIN	B09BJMY8HL
Best Sellers Rank	#1,484,591 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #618 in HEPA Air Purifiers
Brand	LEVOIT
Brand Name	LEVOIT
Colour	White
Control Method	Voice
Controller Type	Mobile app, Voice assistant
Customer Reviews	4.6 out of 5 stars 5,653 Reviews
Filter Type	HEPA
Floor Area	3175 Square Feet
Global Trade Identification Number	00810043375214
Included Components	1 × Smart Air Purifier 1 × 3-in-1 Original Filter (Pre-Installed) 1 × User Manual 1 × Quick Start Guide
Item Dimensions D x W x H	31.2D x 31.2W x 59.9H Centimeters
Item Type Name	Core 600S-P
Item Weight	6.21 kg
Manufacturer	LEVOIT
Model Number	LAP-C601S-WUK
Noise Level	26 Decibels
Part Number	LAP-C601S-WUS
Particle Retention Size	0.3 Micron
Power Source	Corded Electric
Power Source Type	Corded Electric
Product Dimensions	31.2D x 31.2W x 59.9H Centimeters
UPC	810043375214
Unit Count	1.0 Count
Wattage	66 Watts

LEVOIT Air Purifiers for Home Large Room, Covers up to 1588 Sq. Ft, Smart WiFi and PM2.5 Monitor, H13 True HEPA Filter Removes 99.97% of Particles, Pet Allergies, Smoke, Dust, Auto Mode, Alexa Control

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