Your Breville/ Polyscience smoking gun has a round stainless steel mesh filter the protects the fan blades from becoming jammed by small pieces of wood chip. These filters need regular cleaning and replacing if they become damaged, clogged or lost. 

20 X Replacement Mesh Filter Screens for The SMOKING GUN by BREVILLE/PolyScience

Part D - Removable mesh filter Push out with finger to replace (As shown in picture #2)

Quantity: 20 Replacement Filter Screens

Fits: Breville/PolyScience - The Smoking Gun™

(please refer to your manual and the pictures posted above)

Material: Type 304 Stainless Steel

Size: 3/4"

(fits The Smoking Gun™ BSM600SIL/ Model SP0016301)

Quantity:  20 PIECES Stainless Steel Mesh Screens each

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Tracking Number is provided at time of shipping