Why is the little rectangle on the side sucking in so much air and causing it not to work?

Just experienced this "rectangle sucking tons of air" problem with my UV850 Shark - turns out there was not one but two blockages: one in the hose and one in the very base of vacuum (which necessitated using a screwdriver to open the two grey screws on the bottom). Once I got these cleared the vacuum was back to normal.

What is the difference between Shark NV 352 and the NV 356

The 352 has a 25 foot cord, the 356 (professional) is 30', the hard floor tools are different. The 356 has a microfiber 'dust pad' that goes over the hardwood floor attachment. The 352's hard floor attachment has a 'V' shape to funnel debris no pad, but it does have a duster attachment both available to purchase separately. The dust cup on the 356 is larger and the overall machine is 2 lbs heavier then the 352. 356 also comes with a bag for the tools where my 352 did not. The other tools all appear to be the same on both models. They both run the same amps and can be converted into canister mode as well, but are aesthetically different.

How do you clean the filter?

There is a HEPA filter in front of the vacuum, you lift the door from the bottom and you can take it out and wash it. and then you lift the canister out from the base ( like you're emptying the canister of dirt.) You will find 2 foam filters there. lift them both out and wash those too. Just dont throw in washing machine or dishwasher. I use dish detergent and wash them off in the sink. Just make sure they are completely dry before putting them back on the vacuum. After a dozen or so washings they will break down ( you will know this ) extra filters can be purchased on EBay or Amazon or other websites. I usually clean the foam filters when they are a very dark brown or gray color,then i also wash the HEPA filter also. Good luck! Here a PDF file that tells you all about the shark vacuum .Page 13 & 14 tell you how to clean the filters . http://prcind.com/user_manuals/NV351-FS.pdf

Brand	Shark
Special Feature	HEPA, Hypoallergenic, Lightweight, Portable, Wheels
Filter Type	HEPA Filter
Included Components	24 Inch Crevice Tool, 5.5 Inch Crevice Tool, Dusting Brush, Shark Navigator Lift-Away Vacuum, Small Pet Hair Power Brush
Is It Cordless?	No
Capacity	1.1 Quarts
Wattage	1200 Watts
Hose Length	8 Feet
Recommended Uses For Product	Carpet, Bare Floor, Stairs, Upholstery
Form Factor	Upright
Colour	Lavender
Model Name	nv352
Product Dimensions	38.1L x 29W x 115.6H Centimeters
Noise Level	80 Decibels
Amperage	10 Amps
Battery Life	1 Hours
Manufacturer	SharkNinja
Number of Items	1
Controller Type	Push Button
Motor Horsepower	2 Horsepower
Control Method	Remote
Style	Lift Away
Connectivity Technology	USB
Portable	Yes
Number of Power Levels	1
Series number	352
Indoor/Outdoor Usage	Indoor
Finish Type	Matte
Global Trade Identification Number	00622356530828, 10622356530825
Maximum Horsepower	2 Horsepower
UPC	622356530828
Department	mens
Item model number	NV352
ASIN	B004Q4DRJW

SharkNinja Navigator Lift-Away Vacuum (NV352)

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