Question 1

Do I need a permit to install a dust collector?

Accepted Answer

Check with your local code enforcement agency, but in most cases you do need a permit. You can get fined for installing the dust collector without getting prior authorization.

Question 2

What is the efficiency of a dust collector?

Accepted Answer

A properly sized dust collector is 99.9% efficient by weight (of inlet loading) down to one micron. This means if the dust collector loading is 100 pounds per hour, the bags will capture 99.9 pounds of the dust that is over one micron. This is a minimum efficiency figure. Pleated elements and special fabrics can improve efficiency.

Question 3

Why do I need a dust collector on top of my silo?

Accepted Answer

Approximately 50 pounds (or more) of dust are exhausted into the atmosphere. A properly sized dust collector will capture this dust and return it to the silo.

Question 4

When would I use a pulse jet collector?

Accepted Answer

The pulse jet collector was designed for continuous-duty applications where shutdown for cleaning is impractical. The pulse jet collector uses compressed air to clean the bags and the bags can be cleaned while on line.

Question 5

When would I use the NOVA high temperature dust collector?

Accepted Answer

The NOVA is used when the design temperature exceeds 550º F. The maximum operating temperature of the NOVA is 1650º F.

Question 6

How do I size the dust collector for my silo pneumatic filling operation?

Accepted Answer

When designing a dust collector for a silo, the following information is required: fill line size; quantity of lines filling at one time; air flow and pressure; loading time and material handled. Most applications use a single 4" or 5" diameter fill line running at 350 cfm @ 12-15 PSI for approximately 45 minutes. The material handled is either cement, flyash, or sand. A mechanical shaker dust collector with 250 sq.ft. of cloth area will be adequate for these applications.


Silo Filter Vents and Larger Batcher Vents Small Batcher Vents		Part#	Fabric	For Griffin Model#
	4" D x 38 1/2" L Type: Snap-In; Grommet Top	550-438DG	Polyester	18CDS-DH, 18VDS-DH 36IS, 36JS, 36CDS, 36VES 54IS, 54JS 72IS, 72JS, 72BS
	4" D x 79" L Type: Snap-In; Grommet Top	550-479DG	Polyester	36KS, 36LS 54KS, 54LS 72KS, 72LS, 72BDHS, 72DHLS, 72CS
	4" D x 42" L Type: Cuff Bottom; Grommet Top	550-442D	Polyester	36I, 36J, 72L, 72B
	4" D x 84" L Type: Cuff Bottom; Grommet Top	550-484D	Polyester	36K, 36L 72BDH, 72N, 72C
	6" D x 42" L Type: Cuff Bottom; Grommet Top	550-642D	Polyester	16D, 16E, 16OD, 16VE May be Disk or Grommet Top. Please Check
	6" D x 84" L Type: Cuff Bottom; Disk Top	550-684D	Polyester	16H, 16G
	6" D x 42" L Type: Cuff Bottom; Disk Top	550-642DX	Polyester	16D, 16E, 16CD, 16VE May be Disk or Grommet Top. Please Check
	Type: Snap-In For current models	550-411DGX	Polyester	18CDS, 18VDS, ST18CDS, ST18VDS
	Type: Cuff Bottom Bags for Older Models	Grommet Top 550-412D	Polyester	18CD, 18VD, ST18CD, ST18VD
	Type: Cuff Bottom Bags for Older Models	Disk Top 550-412DX	Polyester	18CD, 18VD, ST18CD, ST18VD

Thank you for your interest.

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