Raw materials collection: The coir dust used in this study was collected from a coir fibre mill situated in Jessore district of Bangladesh, while rice husk was collected from an auto rice mill situated in Mymensingh district of Bangladesh. Sample preparation: The initial moisture content of the raw coir dust was about 71 % (dry basis). The coir dust was then sun dried for 7 days to reduce its moisture content to around 11% (dry basis). While moisture content of the rice husk was 10.3 % (dry basis). Moisture content was determined by oven drying method. Thereafter, coir dust and rice husk were thoroughly mixed at ratios of 0:100, 20:80, 40:60, 50:50, 60:40 and 80:20 and labelled throughout the manuscript as Control, A, B, C, D and E, respectively. Briquetting operation: Briquetting operation was carried out using a diescrew press type briquetting machine previously used for rice husk briquetting. The screw used for briquetting the coir dust and rice husk blends is tapered in shape and rotates at a speed of about 450-480 rpm. Since the compression strength of the briquettes depends on the densification temperature, the temperature of the heated die was maintained in the range of 250 to 2800C. This temperature is sufficient to fluidize the lignin present in the biomass and thus act as a binder. Briquettes obtained from this process were 60 mm in diameter with a central hole and carbonized outer surface. Determination of bulk density of briquettes: Density is an important parameter of biomass briquettes, since high density is desirable in terms of transportation, storage and handling. Five samples were prepared for each blend ratio to determine their average density values. Dimensions and weight of the samples were measured using a vernier callipers and a digital balance, respectively. The density of the briquettes was calculated using equation, ???? = W/(A1 − A2)L where: ρ is density, g/cm3 ; W is weight, g, A1 is outer surface area, cm2 ; A2 is hole area, cm2 ; L is length, cm. Determination of compressive strength: Compressive strength is the maximum crushing load a briquette can withstand before cracking or breaking. This parameter is used as an evaluation criterion for briquette durability. Compressive strength of the produced briquettes was determined by diametrical compression. The compression test was performed using a universal testing machine. Five samples with different lengths from each blend were prepared for this measurement and the average value reported. The compressive strength of the briquettes was calculated using equation, C = P/(A1 − A2), where: C is compressive strength, N/cm2 ; P is applied load, N; A1 is outer surface area, cm2 ; A2 is hole area, cm2. Determination of calorific value: Calorific value is one of the most important characteristics of a fuel. This is the measurement of the heat or energy released by a fuel during the complete combustion and expressed as kcal/kg or MJ/kg. During this experiment, calorific value of produced briquettes was determined from Institute of Fuel Research and Development, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka-1205, Bangladesh. Determination of burning rate: This determines the rate at which a certain mass of fuel is combusted in air. For this test, 2 kg of briquettes from each blend were prepared. Samples were stacked in the hearth of different household stoves and stoves were ignited at the same time. This was continued for two hours. After that, amount of fuel unburnt was recorded. Time was recorded with stop watch. Burning rate was calculated from the equation, BR = (Q1 − Q2)/T, where: BR is burning rate, kg/min; T is total burning time, hour; Q1 is initial weight of fuel prior to cooking, kg; Q2 is final weight of fuel after cooking, kg. Determination of water vaporizing capacity: This a measure of how much water vaporized with a specific amount of fuel during combustion. During this test, 3 kg of briquettes from each blend were prepared and were stacked in the hearth of different household stoves. Aluminium pots containing 3 litres (l) of water were mounted on each stove. Then stoves were ignited at the same time and continued until briquettes burnt completely. After that volume of water evaporated from each pot was measured. Water vaporizing capacity (WVC) was calculated using equation, WVC = (V1 − V2)/W, where: WVC is water vaporizing capacity, l/kg; W is weight of fuel, kg; V1 is initial volume of water prior to cooking, l; V2 is final volume of water after cooking, l.