Get In Touch

Fill in your details below and click 'Submit'

Customer Login


Total: £0.00

View Cart

Free Next Day Delivery

For orders over £50 placed before 4.00pm

Pest Expert Formula P Fumer Cluster Fly Smoke Bombs (Twinpack)

£5.79 excl. VAT
£6.95 incl. VAT

Select Quantity

Qty From Qty To Unit Price
1 £5.79
2 5 £5.70
6 10 £5.65
11 50 £5.32


The Pest Expert Formula 'P' Cluster Fly Smoke Bombs are a fumigation device for eradicating cluster fly infestations in your home or loft and an essential part of any cluster fly treatment.

  • Cluster fly killing fumigation device
  • Fast knockdown of cluster flies in lofts or roof spaces
  • Treats an area of 120m3
Product Information
The Formula 'P' Fumer is a cluster fly killing smoke bomb which releases an insecticidal (permethrin) smoke and is ideal for getting rid of cluster flies in lofts, roof spaces or other areas of the home. 

One smoke bomb will treat a room of approx 6m x 8m (standard ceiling height) and one twinpack should be sufficient to eradicate a cluster fly problem in a standard roof space in a 2-3 bedroom house. To treat a cluster fly infestation in a larger loft area or several rooms add extra Fumers as necessary.

Contain Permethrin at 13.25% w/w.

Directions for use
Check roof spaces for bats or evidence of bats.

Pets/children should be kept out of area at time of treatment and until gas has completely dispersed (2-3 hours). Any fish tanks should be removed and water tanks in lofts should be covered.

Make the area to be fumigated as smoke tight as possible by closing all windows, doors etc.
Place smoke bomb(s) on a heat-resistant surface, for example a biscuit tin lid or an old plate. Handle with care after use as they can become quite hot.
Light the fuse and vacate the room/area. Leave for at least 2-3 hours for the smoke to disperse and then ventilate the room thoroughly.
NB We would recommend wearing a safety mask when using this product.

Use when you notice signs of cluster fly activity. The Pest Expert Formula 'P' Fumer is an essential component in the treatment of a cluster fly infestation and is best used in combination with a residual insecticide such as Pest Expert Formula 'C' Cluster Fly Spray for longer-lasting cluster fly control. 

For value for money, please see our
Cluster Fly Control Kits which contain a range of our best cluster fly treatment products. 

Most popular products

Customer Reviews
Write an online review and share your thoughts with other shoppers!

Reviewer: Vld from West sussex   5 Stars
Old barn with lots of old beams and entry/exit points. Cluster flies a mega problem. Used smaller smoke “bomb”in mezzanine. Two hours later patio outside and on windowcills what looked like thousands of cluster fly bodies. Success!! Nothing else has worked. Impossible to spray all beams and windows with preventative so happy to use smoke bombs on a regular basis.